某元素最高正价氧化物对应的水化物的化学式是H2XO4，这种元素的气态氢化物的化学式为 [ ]
A．HX
B．H2X
C．XH3
D．XH4
答案：B
Tom was born _____ April 1st, and I was born _____ April, too. [ ]
A. in; in
B. in; on
C. on; in
D. on; on
下列抗甲状腺药中何药能诱发甲亢（）
A.甲硫氧嘧啶
B.甲巯咪唑
C.卡比马唑
D.大剂量碘化钾
E.普萘洛尔
