Question

【题目】To keep the classroom clean, please _______waste paper whenever you see it.
A.throw away
B.pick up
C.put up
D.send up

Answer 1

【答案】B
【解析】throw away “扔掉”；pick up “捡起”； put up “举起”；send up “发射”。根据句意“为了保持教室清洁，无论何时你看到废纸请捡起来”可知，选B。