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【单选题】
以下关于EDTA标准溶液制备叙述错误的是A.
使用EDTA基准试剂，可以直接法制备标准溶液
B.
标定条件与测定条件应尽可能接近
C.
配位滴定所用蒸馏水，必须进行质量检查
D.
标定EDTA溶液需用二甲酚橙为指示剂
E.
EDTA标准溶液应贮于聚乙烯瓶中
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【单选题】听力原文：W: I certainly hope the library will be open this Saturday. M: Here are the library hours! Week days 8 am to 9 pm, on Saturdays 9 am to 5 pm, Sunday closed. When will the library be open on Satur...
A.
8 am to 9 pm.
B.
9 am to 5 pm.
C.
Closed.
【单选题】The information provided in this passage may help us______.
A.
make better use of the library as a useful service institution
B.
pay more attention to up-to-date news provided in libraries
C.
better understand librarians and appreciate their hard work
D.
save more time for entertainment in library activities
【简答题】当人在寒冷环境中增加产热量的主要方式是（ ）。
【单选题】The rescue team was________the village in order to save the people trapped in the coal mine. [ ]
A.
heading
B.
heading for
C.
heading on
D.
heading upon
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