考博英语词汇语法题是各博士招生院校常考题型之一，新东方在线考博频道整理了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