.Lucy often gets up at _____ six fifteen. [ ]
A. on
B. in
C. around
D. of
答案：C
与原发性血小板减少性紫癜的发病有关的原因是（）
A.免疫异常
B.细菌感染
C.血管畸形
D.营养不良
E.代谢异常
—Why did Miss Yang look so worried when we saw her?
—Because she wondered __________.
A．where did the other students go
B．when would the policeman come
C．what her students have done during the trip
D．if her students had survived the earthquake
