how many levels of course (have you) bought?谓语+主语?还是主语+谓语?

Many scientists believe sea levels ______ by more than one meter by the end of the 21st century.

A．will be risen	B．will have risen
C．will have been	D．will be rising

Rising levels of carbon dioxide in the atmosphere are a major cause of climate change, and now a new study has confirmed that atmosphere CO ₂ is also affecting the ocean chemistry and potentially harming sea life.
Montana State University scientist Robert Dore has been researching the water in the Pacific Ocean for almost two decades. “We’ve been going to the same spot in the Pacific Ocean, and we try and characterize long-term change in the open ocean environment. And one of the key things that we measure is CO ₂ levels. And we’ve been able to record this increasing quantity of atmosphere CO ₂ into the ocean.”
Scientists expected that as atmosphere CO ₂ increased, more and more of the carbon dioxide would be absorbed into the ocean, affecting the chemical balance of the sea water, with a potentially harmful impact on shellfish and coral in particular.
“As carbon dioxide dissolves in the water or seawater in this case, it forms a weak acid, carbonic acid,” Dore explains. “And therefore, as the concentration of CO ₂ in the atmosphere goes up and that exchanges with the surface seawater, it drives the pH down, and makes it more acidic.”
The seawater samples Dore and his colleagues have analyzed confirm what the theory predicts.
The effect was particular striking at about 250 meters down, and again at 500 meters. Dore and his colleagues came up with two possible explanations. It could be that surface water picked up CO ₂ and then moved to those depths. Or there could be a biological explanation.
“It’s important to realize that the oceans are really becoming acidic. And it can have negative impacts on a whole variety of sea life from fish to coral. It’s potentially catastrophic.”
小题1:What can be the best title of the passage?

A．Scientist Researching Seawater

B．Sea Life Facing Danger

C．Oceans Becoming More Acidic

D．Climate Change Affecting Seawater

小题2:With the increase of atmospheric CO ₂ , _______.

A．more corals will appear in the sea

B．the chemical balance of the seawater is affected

C．the surface water is becoming warmer

D．the pH of the ocean out here has been increasing

小题3:Which of the following shows the process of the impact of atmospheric CO2 on sea life?
a. Sea life is endangered.
b. CO ₂ goes into the surface water.
c. The ocean chemistry is affected.
d. CO ₂ decreases the pH and makes the seawater more acidic.
e. CO ₂ levels in the atmosphere go up.

A．a→b→c→d→e	B．e→b→c→d→a
C．a→e→b→c→d	D．e→d→c→b→a

小题4:Scientist Robert Dore came to the conclusion based on_______.

A．the expectation of other scientists

B．some former theory

C．his research and analysis

D．a major cause of climate change

Cities with high levels of homeownership—in the range of 75%, like Detroit and St. Louis—had on average considerably lower levels of economic activity and much lower wages and incomes. Far too many people in financial problems are trapped in homes they can’t sell, unable to move on to new centers of opportunity.
The cities and regions with the lowest levels of homeownership—in the range of 55% to 60% like Los Angeles and New York—had healthier economies and higher incomes. They also had higher levels of happiness and well-being.
I was shocked to read these interesting points that Richard Florida made in his recent article. Let me try to understand. The people in Detroit and St. Louis are less happy than the people in New York, and Los Angeles. And, the reason is because of homeownership rates?
First, to compare them to New York City (the economic capital of the world), Los Angeles (the entertainment capital of the world) seems unfair. Most people in almost any other city in the world might be less happy!
Next, let’s try a different way of determining whether renters are happier than homeowners. Why don’t we ask them? Fannie Mae’s National Housing Survey 2010 reported:
75% of current renters believe owning a home makes more sense.
67% plan to buy a home at some point in the future.
When they asked current renters for the major reason to buy a house, these were their answers (they could pick several answers):
78% said it was a good place to raise children.
75% said because they would feel safe.
70% said because you have control of your own space.
If you believe renters are happier, you would also have to believe the majority enjoy living in a less safe environment, which wouldn’t be a good place to raise children and would be a place where they have less control of their space.
小题1:Which of the following is a fact?

A．People in Los Angeles earn high incomes because of its low homeownership rate.

B．New York’s low homeownership rate increases people’s happiness levels.

C．Detroit’s high level of homeownership causes its economic problems.

D．St. Louis has a higher level of homeownership than Los Angeles.

小题2:In his article, Richard Florida tried to express that _________.

A．people in Los Angeles are happier than those in St. Louis

B．renting a house is better than owning a house

C．Detroit’s economy is healthier than New York’s economy

D．New York and Los Angeles are happiest cities

小题3:The writer believes that New York City and Los Angeles _________.

A．pay employees highest wages in America

B．benefit from low levels of homeownership

C．are leading cities across the globe

D．are best American cities to live in

小题4:From Fannie Mae’s survey report, we can know that _________.

A．paying rent makes more sense

B．most homeowners plan to sell their houses

C．most renters prefer to become homeowners

D．parents need to buy a house for their children

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