考博英语词汇 语法题是各博士招生院校常考题型之一，旭晨教育考博频道整理了2020 考博英语 词汇语法练习题及答案解析供考博生们参考练习。
1. The atmosphere ________ of certain gases mixed together in definite proportions.
A) composes
B) comprises
C) consists
D) constitutes
2. While he was in the office he________ doing something to doing nothing.
A) preferred
B) liked
C) favoured
D) approved
3. Metals________ when cooled and expand when heated.
A) decrease
B) reduce
C) condense
D) contract
4. Take your raincoat with you________ it rains.
A) by chance
B) in case
C) at large
D) on occasion
5. He was afraid he would have to________ her invitation to the party.
A) refute
B) refuse
C) reject
D) decline
6.At the Committee last Saturday the following proposal was agreed________ by those present.
A) to
B) with
C) over
D) at
7. We went to see the exhibition________ the storm.
A) but for
B) in spite of
C) for the sake of
D) instead of
8.To my surprise, at yesterday’s meeting he again brought________ the plan that had been disapproved a week before.
A) about
B) out
C) back
D) up
9. The doctor took X-rays to________ the chance of broken bones.
A) make sure
B) rule out
C) break down
D) knock out
10. He felt it rather difficult to take a stand________ the opinion of the majority.
A) for
B) against
C) to
D) by
11.He has behaved in the most extraordinary way recently; I can’t________ his behaving like that at all.
A) look into
B) break through
C) account for
D) get over
12. How did it come________ that you made a lot of mistakes in your homework?
A) about
B) along
C) around
D) by
13. He could produce no evidence________ his argument.
A) in respect of
B) in view of
C) in support of
D) on account of
14.The government should________ with the irrational regulations restricting drinking hours.
A) break away
B) come up
C) get away
D) do away
15. I know him well enough to accept his explanation________ .
A) without question
B) by all means
C) at any cost
D) in any case
16. It was a small country house, but it was large________ urban standards.
A) at
B) for
C) by
D) from
17.The travellers sought shelter________ the rain and happened to find a road-side inn.
A) from
B) against
C) for
D) with
18. All our attempts to________ the child from drowning were in vain.
A) regain
B) recover
C) reserve
D) rescue
19. This is the first draft of the book. Please feel perfectly free to________ it.
A) deal with
B) comment on
C) cope with
D) dwell on
20. I was always taught that it was________ to interrupt.
A) rude
B) coarse
C) rough
D) crude
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