Question

Doing science exercises often_______most of the students’spare time.

1. A.
   takes off
2. B.
   takes up
3. C.
   goes off
4. D.
   goes up

Answer 1

B
考查短语辨析。takes off 飞机起飞，takes up 占据，从事，goes off 释放，goes up 上涨，句意：做科学锻炼经常回占据学生们的大多数业余时间。所以选B。