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问题 单项选择题

把下面的六个图形分成两类，使每一类图形都有各自的共同特征或规律，分类正确的一项是：（）

A．①②⑥，③④⑤ 

B．①④⑥，②③⑤ 

C．①③④，②⑤⑥ 

D．①③⑤，②④⑥

答案

参考答案：D

解析：

考查对称性。①③⑤是中心对称图形，②④⑥是轴对称图形。故选D。

改错题

May I have you attention please? I have few things to tell you. When you have class here in the language lab, please be here a little early. Change your shoes before enter the lab. Don’t bring anything here except your text books. When you are into, please don’t touch these machine without permission. Always do as the teacher tell you to. In class you should only speak the English, not Chinese. Recorders can be used make a copy of the listening materials. When class over, turn off your machines and leave the lab one by one.

That’s all. Thank you.
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单项选择题

The campers________their tent in a sheltered valley.

A．established

B．installed

C．pitched

D．fixed
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