(　　　)4.If you want to drive on Mars, you can buy a car which __________ in the air.
A. flies B. to flying C. fly D. to fly

(　　　)5.—How long did it __________ you to get to the nearest bus station?
—I __________ about half an hour getting there.
A. take; took B. spend; took C. spend; cost D. take; spent

(　　　)6.He didn't spend enough time on Maths. __________, he failed the exam.
A. Although B. Even though C. As a result D. So that

(　　　)7.Some people __________ want to live on the Earth. They want to move to Mars __________.
A. /; either B. no longer; either C. /; instead D. no longer; instead

(　　　)8.Many students think that living on __________ planet is really pleasant.
A. other B. another C. the other D. others

(　　　)9.The Great Green Wall can __________ the wind and sand from moving to the south of China.
A. prevent B. protect C. provide D. promise

(　　　)10.We are not sure __________ it will rain tomorrow.
A. that B. what C. how D. whether

(　　　)11.About __________ of the books in our school library are written in Chinese.
A. four-fifth B. four-fifths C. fourth-fifths D. fourths-fifth

(　　　)12.A survey about protecting the Earth was __________ in our school last Friday.
A. taken out B. carried out C. put out D. given out

(　　　)13.The transport on Mars would be different from __________ on the Earth.
A. this B. it C. that D. one

(　　　)14.—Life on Mars is interesting and amazing, isn't it?
—__________. It is really hard for us to survive there.
A. I agree B. I think so C. Yes, it is D. I don't think so

(　　　)15.—__________ is Mars away from the Sun?
—The distance between the Sun and Mars changes as the planet orbits the Sun.
A. How often B. How soon C. How long D. How far

二、完形填空
Mars is the fourth planet from the Sun and the second smallest planet in the solar system. It is only slightly more than half the size of the Earth. We are always __________ “Is there life on Mars?” Most scientists believe there is no life on Mars because __________ there are very harsh (严酷的). There is __________ oxygen on Mars, and it might be over 20°C at noon and -100°C __________.
A lot of people think there may be plants on Mars. We know that Mars has carbon (碳). This is a kind of material __________ in all plants and animals on the Earth. Through a telescope, Mars looks red. In some places, it seems grey. At times the grey colour __________ grey-green, then brown, and then grey again. The grey-green colour may be a kind of plant life changing colour __________ the seasons. At first scientists thought the red planet was as __________ as the Moon with dust storms blowing over the large sandy deserts, but Mars seems not as __________ as we once believed it to be. According to the latest Mars pictures, scientists have found clues that __________ could be flowing there today, at least during warm seasons. If there is water, there will be hope of finding life on Mars.
(　　　)16.A.talking B.wondering C.knowing D.telling
(　　　)17.A.surfaces B.lands C.conditions D.goods
(　　　)18.A.little B.few C.a little D.a few
(　　　)19.A.at night B.in the daytime C.in the morning D.in the afternoon
(　　　)20.A.to find B.finding C.find D.found
(　　　)21.A.gets B. turns C.looks D.seems
(　　　)22.A.for B.by C.along D.with
(　　　)23.A.lifeless B.hopeless C.far D.along
(　　　)24.A.cold B.hot C.dry D.wet
(　　　)25.A. ice B.water C.plants D.life