百日咳的临床过程包括（）
A.反应期
B.卡他期
C.痉咳期
D.恢复期
E.发热期
参考答案：B, C, D
一个长方体的汽油桶，底面积是16平方分米，高6分米，如果1升汽油重0.74千克，这个油桶可以装汽油多少千克？
—Did you watch the basketball match yesterday?
—Yes. You know, Jeremy Shu-How Lin, who is one of my heroes, ________ in the match.
A．is playing
B．has played
C．was playing
D．had played
