问题
选择题
For most people, it’s very difficult to _____ air on the top of Qomolangma.
A．take out
B．take off
C．take up
D．take in
答案
答案：D
题目分析：句意：对于大多数人来说，在珠穆朗玛峰顶上呼吸空气是非常困难的。take out取出，拿出；take off脱，摘，起飞；take up开始从事; 接受（提议）; take in吸收; 领会。所以选D。