根据收入弹性分类法,休闲活动有多少类()
A.2
B.3
C.4
D.5
参考答案:B
Keri has brains. In fact, I doubt if anyone in the class has ____ IQ.
[ ]
A. a high
B. a higher
C. the higher
D. the highest
要将
转化为
应选用的试剂是( )
A.盐酸
B.硫酸
C.烧碱
D.二氧化碳和水