秦始皇和汉武帝为安定北边,都曾派兵大举反击哪一游牧民族的进扰:[ ]
A.突厥
B.女真
C.契丹
D.匈奴
答案:D
成年人基础代谢水平在30岁以后每10年约降低()
A.2%
B.4%
C.6%
D.8%
E.10%
Guangzhou was the second Chinese city to host the Asian Games because Beijing ________ the event
before.[ ]
A. had held
B. was held
C. held
D. had been held