— Where are you?
— I'm __________ the classroom.[ ]
A. in
B. on
C. under
D. to
答案:A
The last Thursday of November, _______ as a day of thanksgiving in western countries, is an important festival.
A.observing
B.being observed
C.to be observed
D.observed
粗集料的压碎试验结果较小,说明该粗集料有()。
A、较好的耐磨性
B、较差的耐磨性
C、较好的承载能力
D、较差的承载能力