863.Jack can't concentrate on his lessons recently.

Yes, that might ____ why he did so badly in the last test.

A.answer for

B.apply for

C.account for

D.call for

864.The public ____ Yuan Longping, a great mind who has devoted himself to the research into hybrid rice (杂交水稻）.

A.live up to

B.look up to

C.come up with

D.put up with

863.答案是C;

考查动词短语的辨析。answer for对…负责,承担责任;apply for申请;account for解释…的原因，占比例；补偿;call for需要，邀约。句意:近来杰克上课不专心。的，那也就是他上次考试成绩不佳的原因。

864.答案是B;

考查动词短语的辨析。live up to不辜负，与...相配:look up to尊敬:come up with提出；put up with忍受。根据句意，选B。