人们在海底发现了一种新型矿产资源“可燃冰”,它的主要成分是[ ]
A.干冰
B.甲烷
C.冰
D.煤和石油
答案:B
As we all know, it is ____responsibility as well as ___honor for a country to be chosen to host the Olympic Games.
A.a, a
B.the, the
C.a, an
D.an, an
下列容易发生性侵害的场所有()
①影院
②教室、礼堂
③公园假山内
④单位的仓库
A、①②
B、①③
C、③④
D、①③④