疟疾发作的典型表现为（）
A.周期性寒战
B.发热
C.出汗
D.贫血
E.腹泻
参考答案：A, B, C
Tom along with his classmates ______ for the coming exam.
[ ]
A. are preparing
B. are preparing themselves
C. is preparing him
D. is preparing himself
我国第一部诗歌总集是______。
