霍乱病人发病后最先出现的常见症状是（）
A.呕吐
B.腹泻
C.腹痛
D.畏寒发热
E.肌肉痉挛性痛
参考答案：B
Mr Smith, looking ______, started to work out a problem.
A．puzzled, puzzling
B．puzzling, puzzled
C．puzzled, puzzled
D．puzzling, puzzling
—Thank God we’ve finally cleared up some problems. Let’s ______, shall we?
——All right. See you tomorrow.
A．go Dutch
B．get it straight
C．call it a day
D．make a meal of it
