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问题 实验题

小亮同学对课本中C和CuO反应的产物进行了进一步的探究。以下是他进行实验的部分流程（装置气密性良好）：

(1)通过以上实验，可知产物中有_________________________________气体。    

(2)取出反应后的固体，观察呈红色。

【查阅资料】    ①C也能将CuO还原为红色固体Cu2O（氧化亚铜）    

②Cu2O+H2SO4(稀)=Cu+CuSO4+H2O   

【猜想】(a)红色固体只是Cu    

(b) __________________________________________________________________。    

(c)红色固体是Cu和Cu2O的混合物    

【实验探究】(3)

【交流与反思】(4)从探究中得到的启示或感受是____

答案

(1)CO2、CO  

(2)红色固体只是Cu2O

(3)

(4)“略”(合理即可)

单项选择题

直贷式个人住房贷款资金可以直接划入（）。

A.开发商的预售款监管账户

B.借款人名下账户

C.借款人指定的账户

D.担保公司经办人员账户
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单项选择题

The development of e-commerce may well bring the world into a brand new era of "electronic currency". At the moment, (52) areas in Europe, the United States and Asia have already started studying the possibility of an electronic currency. Electronic currency is not only about currency. It (53) to an entire finance system on the Net. It includes a virtual numeric currency, an electronic system of withdrawals, transfers and loans, and (54) cards of all shapes and sizes. The (55) of an electronic currency system implies the emergence of "virtual banks" and "virtual enterprises". Actually, the first virtual bank appeared in the US in 1995. (56) it is a small and insignificant bank, it represents the trend of the future. In time to come, we may even have to (57) the familiar paper currency.

As the Net pushes the economy (58) rapidly, the economy is also bringing the Net market forward, resulting in the Internet itself becoming the world’s largest emerging market. Of course, this is just the beginning. Although there are many companies which made huge profits (59) in the Internet market, they tend to be small companies. To date, most companies are making losses. The competition in the knowledge-based economy will also be more (60) This will definitely promote (61) and more efficient cooperation.

57().

A.promote 

B.abandon 

C.encourage 

D.celebrate
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