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【单选题】
Three of_study in vocathional schoolA.
they
B.
them
C.
their
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【单选题】Mum told me not to drive____ high spead on the busy street.
A.
in
B.
at
C.
on
D.
over
【简答题】在 Windows 2000 网络 权限 中,( )对共享目录的访问权限最大,( )对共享目录的访问权限最小。
【单选题】--Mum, where is my toy car? You promised. --_____, my dear, but you know mum is pretty busy today. Tomorrow, OK?
A.
So it is
B.
So is it
C.
So did I
D.
So I did
【单选题】与四氯汞钾吸收-盐酸副玫瑰苯胺光度法相比，甲醛吸收-盐酸副玫瑰苯胺光度法测定二氧化硫的优点是毒性低，缺点是（）。
A.
操作条件要求严格
B.
灵敏度低
C.
准确度低
D.
成本高
【单选题】______, he always makes time for his family.
A.
No matter he is busy
C.
No matter how busy he is C. However he is busy C. However busy is he
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