The conventional view________that the Mars' atmosphere is very poor because the planet lacks a magnetic field.
A. covers B. holds C. possesses D. contains
高二英语单项填空简单题
The conventional view________that the Mars' atmosphere is very poor because the planet lacks a magnetic field.
A. covers B. holds C. possesses D. contains
高二英语单项填空简单题查看答案及解析
An interesting suggestion for measuring the atmosphere around Mars has been _________, thus leading a heated discussion among the scientists.
| A．come up | B．put forward | C．swept up | D．accused of |
高二英语单项填空简单题查看答案及解析
An interesting suggestion for measuring the atmosphere around Mars has been _________, thus leading a heated discussion among the scientists.
A. come up B. put forward C. swept up D. accused of
高二英语单项填空中等难度题查看答案及解析
The _________ at the military academy is so rigid that students can hardly bear it.
A. convention B. confinement C. principle D. discipline
高二英语单项填空中等难度题查看答案及解析
It is the first time that Chinese astronaut Wang Yue________as one of the volunteers for the Mars-500 test project .
A. has been selected B. had been selected C. has selected D. selected
高二英语单项填空简单题查看答案及解析
Space is where our future is — trips to the Moon, Mars and beyond. Most people would think that aside from comets(彗星) and stars, there is little else out there. But, since our space journey started we have left so much trash(垃圾) there that scientists are now concerned that if we don’t clean it up, we may all be in mortal(致命的) danger.
The first piece of space junk was created in 1964, when the American satellite Vanguard Ⅰ stopped operating and lost its connection with the ground center. However, since it kept orbiting around the Earth without any consequences, scientists became increasingly comfortable abandoning(抛弃) things that no longer served any useful purpose in space.
It is estimated(估计) that there are now over 500,000 pieces of man-made trash orbiting the Earth at speeds of up to 17,500 miles per hour. The junk varies from tiny pieces of paint chipped off rockets to cameras, huge fuel tanks, and even odd items like the million-dollar tool kit that astronaut Heidemarie Stefanyshyn Piper lost during a spacewalk.
The major problem with the space trash is that it may hit working satellites and damage traveling spacecraft(飞船). Moreover, pieces of junk may collide(碰撞) with each other and break into pieces which fall back to the Earth. To avoid this, scientists have invented several ways for clearing the sky. Ground stations have been built to monitor larger pieces of space trash to prevent them from crashing into working satellites or space shuttles. Future plans include a cooperative effort among many nations to stop littering in space and to clean up the trash already there.
1.What was the first piece of man-made space trash?
A. A camera. B. A tool kit.
C. A broken satellite. D. A fuel tank.
2.Why were scientists NOT concerned about space trash in the beginning?
A. It did not cause any problems.
B. It no longer served any useful purpose.
C. It was millions of miles away from the Earth.
D. It was regarded as similar to comets and stars.
3.Which of the following statements is true about space junk?
A. It is huge, heavy machines.
B. It may cause problems for space shuttles.
C. It floats slowly around the Earth.
D. It never changes position.
4.What has been done about the space trash problem?
A. Ground stations are built to help store the trash properly in space.
B. Many nations have worked together to stop polluting space.
C. Large pieces of space trash are being closely watched.
D. Scientists have cleaned up most of the trash.
高二英语阅读理解中等难度题查看答案及解析
Space is where our future is — trips to the Moon, Mars and beyond. Most people would think that aside from comets(彗星) and stars, there is little else out there. But, since our space journey started we have left so much trash（垃圾） there that scientists are now concerned that if we don't clean it up, we may all be in mortal （致命的）danger.
The first piece of space junk was created in 1964, when the American satellite Vanguard I stopped operating and lost its connection with the ground center. However, since it kept orbiting around the Earth without any consequences, scientists became increasingly comfortable abandoning things that no longer served any useful purpose in space.
It is estimated that there are now over 500,000 pieces of man-made trash orbiting the Earth at speeds of up to 17,500 miles per hour. The junk varies from tiny pieces of paint chipped off rockets to cameras, huge fuel tanks, and even odd items like the million-dollar tool kit that astronaut Heidemarie Stefanyshyn Piper lost during a spacewalk.
The major problem with the space trash is that it may hit working satellites and damage traveling spacecraft(飞船). Moreover, pieces of junk may collide（碰撞） with each other and break into pieces which fall back to the Earth. To avoid this, scientists have invented several ways for clearing the sky. Ground stations have been built to monitor larger pieces of space trash to prevent them from crashing into working satellites or space shuttles. Future plans include a cooperative effort among many nations to stop littering in space and to clean up the trash already there.
1.What was the first piece of man-made space trash?
A. A camera. B. A tool kit.
C. A fuel tank. D. A broken satellite.
2.Why were scientists NOT concerned about space trash in the beginning?
A. It no longer served any useful purpose.
B. It was millions of miles away from the Earth.
C. It did not cause any problems.
D. It was regarded as similar to comets and stars.
3.Which of the following statements is true about space junk?
A. It is huge, heavy machines.
B. It never changes position.
C. It floats slowly around the Earth.
D. It may cause problems for space shuttles.
4.What has been done about the space trash problem?
A. Scientists have cleaned up most of the trash.
B. Large pieces of space trash are being closely watched.
C. Many nations have worked together to stop polluting space.
D. Ground stations are built to help store the trash properly in space.
高二英语阅读理解中等难度题查看答案及解析
课文语法回顾
All scientists subscribe to the view that the increase in the earth’s temperature is due to the burning of fossil fuels like coal, natural gas and oil to produce energy. Some byproducts of this process1. (call) “greenhouse” gases, and the most important one of2.is carbon dioxide. Dr. Janice Foster explained “There is a natural phenomenon3.is called the greenhouse effect. This is when small amounts of gases in the atmosphere, like carbon dioxide, methane and water vapour trap heat from the sun and therefore warm the earth. 4.for the greenhouse effect, the earth would be about 33 degrees Celsius cooler than it is. So, we need those gases. The problem begins when we add huge quantities of extra carbon dioxide into the atmosphere. It means that more heat energy tends to be trapped in the atmosphere 5. (cause) the global temperature to go up.
高二英语语法填空中等难度题查看答案及解析
Common people always hold the view ________ the experts say is right.
A. what that B. that what C. that D. all which
高二英语单项填空简单题查看答案及解析
Some people hold the view that the new machine is advanced, while others are still skeptical _____ whether it is of practical use.
A．with B．about C．for D．on
高二英语单项填空中等难度题查看答案及解析