哮喘发作时的主症有（ ）
A．发热
B．呼气延长
C．喉中哮鸣
D．气促
E．痉咳
参考答案：B,C,D
Don't be worried about his safety. _____, he is an eighteen-year-old young man. [ ]
A. In all
B. After all
C. Above all
D. First of all
什么是国际战略环境？
