在空间中，下列命题正确的是（） A．两组对边分别相等的四

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问题选择题

在空间中，下列命题正确的是（）

A．两组对边分别相等的四边形是平面图形

B．四条边都相等的四边形是平面图形

C．一组对边平行的四边形是平面图形

D．对角相等的四边形是平面图形

答案

答案：C

填空题

冠词填空。

1. Although ______ most of us like to drink beer, those who drink ______ most are ______ least healthy.

2. Xiaomei saw ______ interesting film last night. ______ film was about ______ kind doctor.

3. You can have ______ second try if you fail ______ first time.

4. Tom went to ______ school as usual, but he didn't know his father went to ______ school for a parent

meeting.

5. ______ knowledge begins with ______ practice.

单项选择题

消费者与消费者之间的电子商务，即（）电子商务。

A.B2C

B.B2B

C.G2G

D.C2C