“瘦肉精”中主要成分的通用名称是

A．口服避孕药

B．克仑特罗

C．四环素

D．泼尼松

E．甲状腺素

—Why did Miss Wang look so worried when we saw her?

—Because she wondered       .

A．where did the other students go

B．when would the policeman come

C．if her students had survived the earthquake

D．what she will do during the trip