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【单选题】
I’m sorry you’ve been waiting so long, but it’ll still be some time ___ Brian gets back.A.
before
B.
since
C.
when
D.
after
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参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】下列说法不正确的是
A.
化学键是使离子或原子相结合的作用力
B.
气态单质分子中不一定存在化学键
C.
NaCl与NaOH固体中的化学键类型完全相同
D.
碳原子最外层有4个电子，能与其他原子形成4个共价键
【单选题】Twenty____________ been brought in by villagers.
A.
cattle has
B.
cattles have
C.
cattle have
D.
heads of cattles have
【单选题】( )the villagers here prefer to --- in the cold, which impressed me most.
A.
work on
B.
work at
C.
work for
D.
work out
【单选题】It is wise to put milk on a shelf close to the bottom because it is especially _______ to temperature changes
A.
flexible
B.
fundamental
C.
sensitive
D.
positive
【简答题】在NaCl、NH 4 Cl、Na 2 O 2 、CH 2 =CH 2 、H 2 、CO 2 几种物质中，只存在离子键的为（），只存在非极性键的是（），既有极性键又有非极性键的为（）。
【简答题】The villagers had a (celebrate) ____________, with a new film to finish up with.
【简答题】Because of the heavy snow, some villagers in the mountain area are in ________ . (er , erous)
【简答题】( ) 3. The soldiers soon reached ______ was once an old temple ______ the villagers used as a school.A. which; where B. what; which C. where; which D. what; where
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