What will you do the summer holiday?[ ]
A. to
B. for
C. at
答案：B
My mother is ____________ English teacher.[ ]
A. a
B. an
C. /
正常人体每天需要碘约多少（）
A.50μg
B.100～150μg
C.150～200μg
D.200～250μg
E.250μg
