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按照先减、后乘、再除的运算顺序，给下面两道算式添上括号．

35×224﹣56÷12添上括号的算式是(    ).

2400÷16×17﹣64添上括号的算式是(    ).

用所给词的适当形式填空。

1. My hobby is reading comic books. What about _____ (you)?

2. Two _____ (five) of the students in our class are League members.

3. I don't think it's always right to be busy _____ (make) money all day.

4. He left home in a hurry because he had some problem _____ (solve) in his office.

5. I don't like travelling by plane. I think it's _____ (safe) to travel by train.

通信的过程就是把信息尽快地从一处传递到另一处的过程，如利用烽火台火光传递信息、利用鼓声传递信息等。关于声音与光，下列说法正确的是 [ ]

A．声音和光都是机械波

B．声音和光都是电磁波

C．声音是机械波，光是电磁波

D．声音是电磁波，光是机械波

詹森业绩指数以（）为基础。

A.资本市场线

B.证券市场线

C.有效边界

D.可行边界

加快体制改革和机制创新包括( )。

A．推进政企分开

B．加快行政管理体制改革

C．继续深化国企改革

D．大力发展非公有制经济

E．完善现代市场体系