Question

To keep our classroom clean, please ______ waste paper whenever you see it.

1. A.
   take up
2. B.
   pick up
3. C.
   put up
4. D.
   send up

Answer 1

B
本题意思为：为了保持我们的教室干净，无论何时你看到废纸都应该拣起来。A表示拿起，C表示举起，D表示发射。只有B符合题意。