() 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
A.flies
B.to flying
C.fly
D.to fly
答案：A
解析：
本题考查定语从句的主谓一致。先行词a car为单数，定语从句中谓语动词需用第三人称单数形式。分析选项：A为动词第三人称单数形式，符合要求；B、D为非谓语形式，不能作谓语；C为动词原形，不符合主谓一致。故选A。
() 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
—I about half an hour getting there.
A.take; took
B.spend; took
C.spend; cost
D.take; spent
答案：D
解析：
1. 第一空：考查固定句型“It takes sb. +时间+ to do sth.”，表示“做某事花费某人多长时间”，句中有助动词did，谓语动词用原形take。
2. 第二空：考查固定句型“sb. spend +时间+ (in) doing sth.”，表示“某人花费多长时间做某事”，答句为一般过去时，用spend的过去式spent。结合选项，确定答案。
2. 第二空：考查固定句型“sb. spend +时间+ (in) doing sth.”，表示“某人花费多长时间做某事”，答句为一般过去时，用spend的过去式spent。结合选项，确定答案。
() 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
A.Although
B.Even though
C.As a result
D.So that
答案：C
解析：
前后句子为因果关系，前半句是原因，后半句是结果。A、B选项表让步关系，不符合逻辑；C选项意为“结果，因此”，用于引出结果，符合语境；D选项表目的，不符合逻辑。故选C。
() 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
A./; either
B.no longer; either
C./; instead
D.no longer; instead
答案：D
解析：
1. 分析第一空：根据句意“一些人不再想住在地球上”，需用"no longer"表示“不再”，由此排除A、C选项；
2. 分析第二空："either"用于否定句末尾表“也”，"instead"表示“代替、反而”，此处指搬到火星来代替住在地球，应用"instead"，排除B选项。综上答案为D。
2. 分析第二空："either"用于否定句末尾表“也”，"instead"表示“代替、反而”，此处指搬到火星来代替住在地球，应用"instead"，排除B选项。综上答案为D。
() 8.Many students think that living on planet is really pleasant.
A.other
B.another
C.the other
D.others
A.other
B.another
C.the other
D.others
答案：B
解析：
1. 分析各选项用法：other后接复数名词，题中planet为单数，排除A；another用于三者及以上的“另一个”，后接单数可数名词，符合题中单数planet的搭配及语境；the other特指两者中的另一个，题中无两者范围，排除C；others是代词，后不能接名词，排除D。因此答案为B。
() 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
A.prevent
B.protect
C.provide
D.promise
答案：A
解析：
本题考查动词固定搭配辨析。
prevent...from doing sth.：阻止……做某事；
protect...from...：保护……免受……；
provide常搭配provide sb. with sth.或provide sth. for sb.，表示“提供”；
promise常搭配promise to do sth.等，表示“承诺”。
结合句意“绿色长城能阻止风沙向中国南部移动”，prevent符合固定搭配和语境。
prevent...from doing sth.：阻止……做某事；
protect...from...：保护……免受……；
provide常搭配provide sb. with sth.或provide sth. for sb.，表示“提供”；
promise常搭配promise to do sth.等，表示“承诺”。
结合句意“绿色长城能阻止风沙向中国南部移动”，prevent符合固定搭配和语境。
() 10.We are not sure it will rain tomorrow.
A.that
B.what
C.how
D.whether
A.that
B.what
C.how
D.whether
答案：D
解析：
本题考查宾语从句的引导词辨析。主句“We are not sure”表不确定，从句“it will rain tomorrow”成分完整。A项that用于陈述确定内容，不符合语境；B项what需在从句中充当成分，本从句无需；C项how表“如何”，不符合句意；D项whether表“是否”，符合“不确定明天是否下雨”的语义，故选D。
() 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
A.four-fifth
B.four-fifths
C.fourth-fifths
D.fourths-fifth
答案：B
解析：
英语中分数表达规则为“分子用基数词，分母用序数词；分子大于1时，序数词后加s”。本题表示“五分之四”，分子4（基数词four）大于1，分母用序数词fifth且加s，应为four-fifths。
() 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
A.taken out
B.carried out
C.put out
D.given out
答案：B
解析：
1. 辨析各短语含义：A. taken out（取出，拿出）；B. carried out（实施，开展）；C. put out（扑灭，出版）；D. given out（分发，散发）。2. 结合语境，“关于保护地球的调查”应是被开展，只有carried out符合语义，故选B。
() 13.The transport on Mars would be different from on the Earth.
A.this
B.it
C.that
D.one
A.this
B.it
C.that
D.one
答案：C
解析：
本题考查代词辨析。句中需指代前文的不可数名词transport以避免重复。that可指代前文提到的单数可数名词或不可数名词，符合语境；this表近指，不符合题意；it指代同一事物，此处火星与地球的交通并非同一事物；one指代单数可数名词，而transport是不可数名词，故排除A、B、D。
() 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
—. 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
答案：D
解析：
答语后半句表明说话者不认同“火星上的生活有趣又神奇”的观点，因此应选表示否定态度的选项。
() 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
—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
答案：D
解析：
本题考查疑问词组辨析。A.How often用于询问频率；B.How soon用于询问将来的时间；C.How long用于询问时间长短或物体长度；D.How far用于询问距离。根据答句中的“distance（距离）”可知，问句是询问火星到太阳的距离，故选D。
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 16, “Is there life on Mars?” Most scientists believe there is no life on Mars because 17 there are very harsh (严酷的). There is 18 oxygen on Mars, and it might be over 20℃ at noon and -100℃ 19.
A lot of people think there may be plants on Mars. We know that Mars has carbon (碳). This is a kind of material 20 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 21 grey-green, then brown, and then grey again. The grey-green colour may be a kind of plant life changing colour 22 the seasons. At first scientists thought the red planet was as 23 as the Moon with dust storms blowing over the large sandy deserts, but Mars does not seem as 24 as we once believed it to be. According to the latest Mars pictures, scientists have found clues that 25 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. alone
() 24. A. cold
B. hot
C. dry
D. wet
() 25. A. ice
B. water
C. plants
D. life
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 16, “Is there life on Mars?” Most scientists believe there is no life on Mars because 17 there are very harsh (严酷的). There is 18 oxygen on Mars, and it might be over 20℃ at noon and -100℃ 19.
A lot of people think there may be plants on Mars. We know that Mars has carbon (碳). This is a kind of material 20 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 21 grey-green, then brown, and then grey again. The grey-green colour may be a kind of plant life changing colour 22 the seasons. At first scientists thought the red planet was as 23 as the Moon with dust storms blowing over the large sandy deserts, but Mars does not seem as 24 as we once believed it to be. According to the latest Mars pictures, scientists have found clues that 25 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. alone
() 24. A. cold
B. hot
C. dry
D. wet
() 25. A. ice
B. water
C. plants
D. life
答案：16. B
17. C
18. A
19. A
20. D
21. B
22. D
23. A
24. C
25. B
17. C
18. A
19. A
20. D
21. B
22. D
23. A
24. C
25. B
解析：
16. 考查动词辨析。根据后文“Is there life on Mars?”可知，我们一直“想知道”火星上是否有生命，wondering符合语境，故选B。
17. 考查名词辨析。前文提到火星上没有生命，原因是其“环境条件”非常严酷，conditions表示“条件，环境”，符合题意，故选C。
18. 考查形容词辨析。oxygen是不可数名词，且根据语境火星上几乎没有氧气，little修饰不可数名词表否定含义，符合要求，故选A。
19. 考查短语辨析。前文提到中午温度超过20℃，与之对应的是夜晚温度低至-100℃，at night符合逻辑，故选A。
20. 考查非谓语动词。此处用过去分词found作后置定语，修饰material，表示“在地球上所有动植物中被发现的物质”，符合语法规则，故选D。
21. 考查动词辨析。表示颜色变化常用turn，此处指灰色变成灰绿色，turns符合语境，故选B。
22. 考查介词辨析。with表示“随着”，这里指植物随着季节改变颜色，符合语义，故选D。
23. 考查形容词辨析。根据后文“with dust storms blowing over the large sandy deserts”可知，最初科学家认为火星和月球一样没有生命，lifeless表示“无生命的”，故选A。
24. 考查形容词辨析。根据后文提到发现水的线索，可知之前认为火星很干燥，dry符合语境，故选C。
25. 考查名词辨析。根据后文“If there is water”可知，科学家发现了水可能流动的线索，water符合题意，故选B。
17. 考查名词辨析。前文提到火星上没有生命，原因是其“环境条件”非常严酷，conditions表示“条件，环境”，符合题意，故选C。
18. 考查形容词辨析。oxygen是不可数名词，且根据语境火星上几乎没有氧气，little修饰不可数名词表否定含义，符合要求，故选A。
19. 考查短语辨析。前文提到中午温度超过20℃，与之对应的是夜晚温度低至-100℃，at night符合逻辑，故选A。
20. 考查非谓语动词。此处用过去分词found作后置定语，修饰material，表示“在地球上所有动植物中被发现的物质”，符合语法规则，故选D。
21. 考查动词辨析。表示颜色变化常用turn，此处指灰色变成灰绿色，turns符合语境，故选B。
22. 考查介词辨析。with表示“随着”，这里指植物随着季节改变颜色，符合语义，故选D。
23. 考查形容词辨析。根据后文“with dust storms blowing over the large sandy deserts”可知，最初科学家认为火星和月球一样没有生命，lifeless表示“无生命的”，故选A。
24. 考查形容词辨析。根据后文提到发现水的线索，可知之前认为火星很干燥，dry符合语境，故选C。
25. 考查名词辨析。根据后文“If there is water”可知，科学家发现了水可能流动的线索，water符合题意，故选B。