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【简答题】
中国航空集团公司总部在________，中国南方航空集团公司总部在________，中国东方航空集团公司总部在________。
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反馈参考答案：
举一反三
【简答题】活化能大小直接反映了 对温度的敏感程度。
【单选题】. I have just come in to see if I can be _________ any assistance to them.
A.
with
B.
on
C.
at
D.
of
【单选题】—How many birds can you see in the trees? —I can see ________birds in them. [ ]
A.
hundreds of
B.
five hundreds
C.
hundred of
D.
five hundreds of
【单选题】I wonder when they ________ for Beijing. I will go to the train station to see them off when they _______.
A.
will leave; leave
B.
leave; will leave
C.
will go; leave
D.
go; leave
【简答题】数据库系统的三级模式结构是指数据库系统由（ ）、（ ）和（ ）三级构成。
【单选题】— Can you see the ______? — Sorry, I can’t see them.
A.
tree
B.
Chinese books
C.
English book
D.
apple
【单选题】I wonder when they ___ for Beijing. I will go to the train station to see them off when they ______.
A.
leave, will leave
B.
will leave, leave
C.
will go, leave
D.
go, leave
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