抗甲状腺药物有如下两类（）
A.咪唑类和磺脲类
B.咪唑类和硫脲类
C.咪唑类和碘制剂
D.磺脲类和双胍类
E.磺脲类和硫脲类
参考答案：B
月球上没有空气，所以登上月球的宇航员及时相距很近也需要靠______ 交谈，因为______．
Tom didn't go hiking with his classmates ____ his illness. [ ]
A. because
B. because of
C. as
D. since
