他在大学专修数学。

(3)The majority of doctors believe smoking is harmful to health.

大多数医生认为吸烟有害健康。

[单句改错]

(4)One third of the country is covered with trees and the majority of the citizens black people.

4．Trees take in carbon dioxide and give out oxygen.

树木吸收二氧化碳，释放氧气。

take in吸收；理解；欺骗；收容；接纳

take down记下；取下；拆掉

take off脱下；起飞；成功

take on雇佣；承担；呈现

take over接管

take up占据；从事；继续；接受

(1)Studying this company takes up most of his time these days.

这些天研究这家公司占了他的大部分时间。

(2)Can I just take down what you have just told us?

我可以记下你刚才告诉我们的事情吗？

(3)Mr Smith was in hospital；I had to take over his work.

史密斯先生住院了；我只好接管他的工作。

[一词多义]　写出下列句子中take in的汉语意思

(4)It took me a long time to take in what he said.理解

(5)Thankfully，the farmer took in the lost travelers for the night.收留

(6)Many people have been taken in by the bad products.欺骗

(7)We humans must take in oxygen to live.吸入

give out放出，发出；分发；宣布，发表；用完

give in让步；投降；上交

give away赠送；泄露；出卖

give back送还；恢复

give up放弃；戒除

give off释放出；辐射出；发生

注意：give out作"用完"讲时，为不及物动词短语，不能用于被动语态。