Distances are not the United States,is the primary three句话怎么

这里cover是什么意思
（汽车）Long distances can be covered rapidly and pleasantly.Many people are now able to enjoy their leisure time by making trips to the countryside or seaside at weekends,instead of being confined to their immediate neighborhood

Airplanes___(able) people to travel great distances faster,
用适当形式填空

英语翻译
Because of the unbelievably vast distances of space,astronauts have only been able to concentrate on the part of space immediately surrounding the earth; satellites and nmanned space shuttles have been launched to explore the rest of the solar system.

In ancient times, people rarely travelled long distances and most farmers only travelled ___________ the local market. A．longer than B．more than C．as much as D．as far as

物理高手 请进
1. Given that the distances to the sun and the moon are approximately 150 million km and 400,000 km respectively. and that the radius of the moon is 1740 km , estimate the radius of the sun.
鉴于在太阳和月亮的距离分别是1.5亿公里和40万公里, 而月亮的半径是1740公里, 计算太阳的半径?
(提示 k=9*10^9 Nm^2/C^2, g=10ms^-2)
有个图我就不发了,左边是太阳,中间是月亮,右边是地球,高手帮下,谢谢!

CLOSE
Most people who travel long distances complain of jetlag(喷气飞行时差反应).Jetlag makes business travelers less productive and more prone ___1___ making mistakes.It is actually caused by ___ 2 ___ of your “body clock” - a small cluster of brain cells that controls the timing of biological ___3___ .The body clock is designed for a ___4___ rhythm of daylight and darkness,so that it is thrown out of balance when it ___ 5___ daylight and darkness at the“wrong”times in a new time zone.The ___ 6___ of jetlag often persist for days ___7___ the internal body clock slowly adjusts to the new time zone.
Now a new anti - jetlag system is ___8___ that is based on proven ___ 9___ pioneering scientific research.Dr.Martin Moore-Ede has ___10___ a practical strategy to adjust the body clock much sooner to the new time zone ___11___ controlled exposure to bright light,The time zone shift is easy to accomplish and eliminates ___12___ of the discomfort of jetlag.
A successful time zone shift depends on knowing the exact time to either ___13___ or avoid bright light.Exposure to light at the wrong time can actually make jetlag worse.The proper schedule ___14___ light exposure depends a great deal on ___15___travel plans.Data on a specific flight itinerary (旅行路线)and the individual's sleep ___16 ___are used to produce a Trip Guide with ___17___ on exactly when to be exposed to bright light.
When the Trip Guide calls ___18___ bright light you should spend time outdoors if possible.If it is dark out - side,or the weather is bad,___19___ you are on an aeroplane,you can use a special light device to provide the necessary light ___ 20___ for a range of activities such as reading,watching TV or working.
1.A) for B)from C)to D) of
2.A) rupture B) corruption C) eruption D) disruptio
3.A) actions B) functions C) reflection D) behavior
4.A) regular B) formal C) continual D) circular
5.A) retains B) encounters C) possesses D) experiences
6.A) diseases B) symptoms C) signs D) defects
7.A) while B) whereas C) if D) although
8.A) adaptable B) approachable C) available D) agreeable
9.A) broad B) inclusive C) tentative D) extensive
10.A) devised B) recognized C) scrutinized D) visualized
11.A) at B) through C) in D) as
12.A) most B) least C) little D) more
13.A) attain B) shed C) retrieve D) seek
14.A)on B)with C)for D) in
15.A) unique B) specific C) complicated D)peculiar
16.A) norm B) mode C) pattern D) style
17.A) directories B) instructions C) specifications D) commentaries
18.A)off B)on C)for D) up
19.A)or B)and C) but D) while
20.A) agitation B)spur C) acceleration

英语选词填空
institutions
distances
winners
world-renowned
prestige
offer
positive
contribution
Cambridge University is a ___1___university with a history of more than 700 years.It has nurtured great scientists,thinkers and poets such as Newton,Bacon,Milton,Byron and Darwin,who made an outstanding ___2___to the progress of mankind.Today,Cambridge University,which has produced more Nobel Prize ___3___than any other university,still takes of significant place among all the ___4___of higher learning in the world.
Cambridge University began its contacts with China as early as over 100 years ago,when it started to___5___ the Chinese language course.The late Dr.Joseph Needham of Cambridge University enjoyed a high___6___ in the Chinese academic circles.He devoted his entire life to the writing of Science and Civilization in China,a monumental work for study on ancient Chinese science and technology and cultural achievements.For 100 years many Chinese scholars,best represented by Mr.Hua luogeng,an outstanding Chinese mathematician,have traveled long___7___ to study in Cambridge.Today,the Chinese academic community still maintains good exchanges and cooperation with Cambridge.This has played a ___8___role in and exerted a sound influence on enhanced cultural exchanges and friendship between the Chinese and British people and progress in science and technology as well as in thinking.

英语翻译
1 Human nature and long distances have made exceeding the speed limit a cherished tradition in the state,so the legislators surprised no one when,acceding to public practice,they rejected increased penalties for speeding.
2 If efficacious new medicines have side effects that are commonly oberserved and unremarkable,such medicines are too often considered safe,even when laboratory tests suggest caution.

sat改错题
Homing pigeons can (navigate over) long distances,(employing) their sense of smell to ascertain their initial location and using (the position) of the Sun (determining) the direction in which they must fly.(No error)
哪个错了?顺便翻下句子.

谁能解释一道基础物理题
Determine the stopping distances for an automobile with an initial velocity of 90km/h and human reaction time of 1.0s for an acceleration -4m/s^2.
翻译：一辆摩托车在以 90km/h 的速度在高速公路上奔跑着,如果该摩托车以 -4m/s^2的速度加速的话,假设人的反应速度为 1s 的话大约该摩托车在减速后还要滑行多长距离?
答案是103米,包括公式,单位还有为什么?
一楼的大大，你刚才的确回答过了，只不过偶太笨，没搞懂而已 - -||。

SAT 改错求助!
Homing pigeons can navigate over long distances,
employing their sense of smell to ascertain their initial
location and using the position of the Sun determining
the direction in which they must fly.
“navigate over”哪里错了?

翻译中文
Stopping distances and severity of crashes:
1.Decrease as vehicle speed increases
2.Are not affected by vehicle speed
3.Increase as vehicle speed increases 什么意思？

高考英语问题（见问题补充）
请问帮我分析一下这个句子,弄不懂啊
是2012年江西卷 D篇
Distances between them appear no greater to a modern traveler than those which once faced men as they walked from village to village.
求指教!

同义词替换
括号内词用选项替换
1.they (span) the long distances between local phone systems as well as providing the backbone for many network systems.
A.across B.override C.exceed D.get across
2.A strength material which is a braided Kevlar yarn strength member surronds the buffer, used to preventing (stretch) problems when the fiber cable is being pulled.
A.extend B.elongate C.expand D.spread
麻烦大大们给个解释~~谢谢

一道基础物理题
原题：Determine the stopping distances for an automobile with an initial velocity of 90km/h and human reaction time of 1.0s for an acceleration -4m/s^2.
翻译：一辆摩托车在以 90km/h 的速度在高速公路上奔跑着,如果该摩托车以 -4m/s^2的速度加速的话,包括人的反应速度 1s 的话大约该摩托车在减速后还要滑行多久?
PS：写出来步骤,
一楼那个不对。这道题是我朋友无聊问我的，
人的反应时间是 1 上面我写成反应速度了，抱歉。