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【多选题】
下面属于电子商务产生条件的是A.
计算机的广泛应用，网络的普及和成熟
B.
信用卡的普及和应用，电子交易安全协议的确定
C.
政府的支持与推动
D.
以上皆是
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反馈参考答案：
举一反三
【单选题】用草酸钠做基准物质标定高锰酸钾溶液时。开始反应速度较慢,稍后反应速度明显加快,这是( )起催化作用。
A.
H +
B.
MnO 4 -
C.
Mn 2+
D.
CO 2
【简答题】Who asked the author such a question?
【单选题】One thing that is obvious to the author is that _______.
A.
animals have their own thinking
B.
animals do things scientists tell them to do
C.
animals think for their own purpose if they can think
D.
animals think when scientists want them to
【单选题】The author became a little impatient for ____.
A.
he couldn't stand up with the shoe repairer's modest attitude
B.
he was in a hurry to meet a friend
C.
the shoe repairer was sad and did nothing about his torn shoes
D.
it took the shoe repairer a long time to have his shoes repaired
【单选题】The author wanted to get the job _____
A.
to meet a husband
B.
to train as a nurse
C.
to support herself in her education
D.
to support her aged parents
【单选题】We can't _____ one to change the habits of a lifetime in a short time.
A.
hope
B.
wait
C.
expect
D.
imagin
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