问题
选择题
Everyone has such a busy life that sometimes it becomes tough to _____ with it.
A．break up
B．end up
C．keep up
D．make up
答案
答案：C
考查动词词组辨析。break up with与……分手；end up with以……告终；keep up with跟上；make up with与……和解。根据语境，应选keep up。
O2气体, 不久前在我国兰州近代物理研究所制备成功, 1 mol 这种