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【单选题】
直接配制标准溶液时必须使用:A.
分析试剂
B.
保证试剂
C.
基准试剂
D.
化学试剂
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反馈参考答案：
举一反三
【单选题】They expected that several hundred guests would attend the opening ceremony, but only ______ people actually showed up.
A.
a great number of
B.
large amounts of
C.
a dozen of
D.
a crowd of
【单选题】Several guests were waiting in the ________for the front door to open.
A.
porch
B.
vent
C.
inlet
D.
entry
【简答题】下列税法构成要素中，属于税法三个最基本要素的是（ ）。
【单选题】Several guests were wailing on the ______ for the front door to open.
A.
porch
B.
vent
C.
inlet
D.
entry
【单选题】There are several guests sitting in the sofa by the window, but ____ are known to me. [ ]
A.
neither
B.
all
C.
no one
D.
none
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