Scientists are trying to develop a special material, _______

　　For years scientists have been worried about the effects of air pollution on the earth’s natural conditions. Some believe the air inside many houses may be more dangerous than the air outside. It may be one hundred times worse.
　　Indoor air pollution can cause a person to feel tired, to suffer eye-pain, headache and other problems. Some pollutants（污染物） can cause breathing disorders, diseases of blood and even cancer, Most scientists agree that every modern house has some kind of indoor pollution. People began to notice the problem in the early 1970s. It is that when builders began making houses and offices they did not waste energy. To do this they built buildings that limited the flow of air between inside and outside. They also began using manmade building materials. These materials are now known to let out harmful gases. As the problem became more serious, scientists began searching for a way to deal with it. They discovered a natural pollution control system for building— green plants. Scientists do not really know how plants control air pollution. They believe that a plant’s leaves absorb or take in the pollutants. In exchange the plant lets out oxygen through its leaves and through its tiny organizations on its roots. Scientists suggest that all buildings should have one large plant or several small plants inside for every nine square metres of space. Studies of different plants show that each absorbs different chemicals. So the most effective way to clean the air is to use different kinds of plants. Having green plants inside your house can make it a prettier and more healthy place.
　　小题1:Generally speaking, indoor air pollution may be more harmful than the air outside because ________.

A．the man - made building materials let out dangerous gases inside houses

B．there may be more harmful gases outside houses

C．the flow of air indoors is limited

D．indoor air pollution can make a person seriously ill

　　小题2:The most effective way to clean the air is to use different kinds of plants because________.

A．they may let out more oxygen which people need

B．they can absorb different kinds of the harmful indoor chemicals

C．they can take in all kinds of indoor pollutants

D．they can make your house prettier and more healthy

The scientists have made an exhaustive study of the virus _______ many people have been inflected.

A．to which

B．in which

C．with which

D．for which

Some scientists think that it will take __ of years to make robots do most work for humans.
A. hundreds B. hundred C. thousand

---I’ve heard some scientists have sent a spacecraft to Mars.
---Really? Has it arrived _____?
A already B yetC still D ever

Many scientists find that colors can change people’s feelings. It’s very interesting. Some colors can make people feel relaxed, and some colors can make people feel nervous. Now，this kind of knowledge is being used in many places. For example，school walls are always painted green because green makes students feel relaxed. It is also good for the students’ eyes. Some bookings they’ve learned from scientific studies. The color red makes people hungry. Many fast food restaurants have red furniture or walls. Soft colors like pink and light blue make people feel relaxed，so they spend more time eating. Loud music may be nices are also green or light blue for the same reason. Restaurant owners not only have to know how to make food，but also have to know how to make money. Here are some thi at first，but it soon makes people want to leave. Hard seats also make customers want to eat quickly and leave. Many restaurants，especially fast food restaurants, use this knowledge to make customers eat faster.
小题1:How does the color green make the students feel?

A．Hungry.

B．Nervous.

C．Angry.

D．Relaxed.

小题2:How does the color red make most people feel?

A．Hungry.

B．Comfortable.

C．Excited.

D．worried.

小题3:Which color isn’t mentioned in this passage?

A．Green.

B．White.

C．Light blue.

D．Red.

小题4:What do many fast food restaurants do?
①Play loud music. ②Play soft music.
③Have hard seats. ④Paint their walls red.

A．①②③

B．①③④

C．①②④

D．②③④

小题5:What’s the best title for this passage?

A．Color and restaurant.	B．Use color to make money.
C．Color and science.	D．Use color to change feelings.

Scientists have found what look like caves on Mars, and say they could be protecting life from the planet ’s terrible environment.
The first caves appear as seven mysterious black dots （点） on the pictures which were sent back by NASA’s Mars Odyssey orbiter. Each as large as a football field, they may be openings into natural caves below the Martian surface.
“If there is life on Mars, there is a good chance that you’d find it in caves,” said Jut Wynne, one of the researchers who noticed th e features (特征) while working on a US Geological Survey Mars Cave Detection Program.
Jonathan Clarke, a geologist with the Mars Society of Australia, yesterday described the discovery as exciting.
One photo taken at night by an infrared imager(红外线成像器) showed one hole to be unusually warm, suggesting hot air may be flowing out.
“I said: ‘Wow, that’s a cave’” Dr. Clarke said excitedly. “People have been looking for these for a long time; now we have found them.”
He agreed such caves could be perfect places to search for life escaping from the bitterly cold, radiation-soaked(充满辐射的), dry surface.
“Tiny drops of water could collect inside,” he said. “If there are gases coming out, they could provide energy for a whole range of bacteria (细菌). A cave is also a protection from radiation; the surface of Mars is exposed to high levels of space radiation.”
The caves probably formed when tube-shaped lava flows(管状岩浆流) spread across the planet long ago. The outside of the tubes cooled, forming solid walls, while something hotter inside allowed the remaining to flow out, forming caves.
小题1: What does the passage mainly talk about?

A．How the caves were formed on Mars.

B．How NASA sent the pictures back to earth

C．Caves on Mars may be full of hot air or a sign（迹象）of life.

D．Scientists have completely recognized the surface of Mars.

小题2: We can learn from the passage that __________.

A．water has already been found on Mars

B．the scientists found all the caves at night

C．it is certain that there is life in these caves

D．the surface of Mars is bitterly cold, radiation-soaked and dry

小题3: According to the passage, Dr. Clarke was so excited because ________.

A．such caves could provide energy for life

B．they had finally found the caves on Mars

C．such caves would be perfect places to search for life

D．There would be life on Mars.

小题4: Necessary conditions for life on Mars mentioned in the passage may include_________.

A．lava and energy	B．water and radiation from space
C．gases and lava	D．water and protection from radiation

小题5: what does the underlined word “ the planet” in paragraph 1 refer to?

A．the Mars

B．the earth

C．the caves

D．radiation

Scientists at Harvard University and Bates College find female chimpanzees (黑猩猩) appear to treat sticks as dolls, carrying them around until they have children of their own. Young males engage in such behavior much less frequently.
The new work by Sonya M. Kahlenberg and Richard W. Wrangham, described this week in the journal Current Biology, provides the first evidence of a wild non­human species playing with dolls, as well as the first known sex difference in a wild animal’s choice of playthings.
The two researchers say their work adds to a growing body of evidence that human children are probably born with their own ideas of how they want to behave, rather than simply mirroring other girls who play with dolls and boys who play with trucks. Doll play among humans could have its origins in object—carrying by earlier apes (猿类), they say, suggesting that toy selection is probably not due entirely to socialization.
“In humans, there are obvious sex differences in children’s toy play, and these are remarkably similar across cultures,” says Kahlenberg. “While socialization by elders and peers has been the primary explanation, our work suggests that biology may also have an important role to play in activity preferences.”
In 14 years of data on chimpanzee behavior at the Kibale National Park in Uganda, Kahlenberg and Wrangham counted more than 100 examples of stick­carrying. Some young chimpanzees carried sticks into the nest to sleep with them and on one occasion built a separate nest for the stick. “We have seen juveniles occasionally carrying sticks for many years, and because they sometimes treated them rather like dolls, we wanted to know if in general this behavior tended to represent something like playing with dolls,” says Wrangham, a Professor at Harvard. “If the doll hypothesis (假设) was right, we thought that females should carry sticks more than males do, and that the chimpanzees should stop carrying sticks when they had their first child. We have now watched enough young chimpanzees to prove both points.”
小题1:What does a female chimpanzee do with sticks?

A．She gives them to her child to play with.

B．She treats them as dolls.

C．She makes useful tools from them.

D．She treats them as weapons.

小题2: What causes the different toy selection of chimpanzees, according to the passage?

A．Sex difference.	B．Socialization.
C．Environment.	D．Cultural difference.

小题3:We can infer from the fourth paragraph that ________.

A．socialization has nothing to do with human’s choice of playthings

B．sex difference is the only factor in human’s choice of playthings

C．the biology factor may also influence toy choice

D．people choose different toys in different cultures

小题4:It can be concluded from the passage that ________.

A．both humans and chimpanzees choose their playthings due to sex difference

B．different factors cause humans and chimpanzees to choose different playthings

C．only female chimpanzees have playthings

D．chimpanzees usually choose playthings for their children