从一点引出8条射线可组成______个角．

下列各组词语中，没有错别字的一项是(　　)

A．枭首啰索病恹恹　不落言荃

B．光碟弓驽笑咪咪　绵里藏针

C．国粹尺牍汗涔涔　唉声叹气

D．流弊神祗乱糟糟　概莫能外

单词拼写。

1. You can _______  _______ (打电话给) Michael if you get to Fuzhou. He will meet you.

2. I think bad _______ (环境) can make people much stronger.

3. If you don't obey the traffic rules, you will _______  ________  ________ (受到罚款).

4. Thank you _______  _______ (邀请) my brother to your birthday party.

5. I'll call the restaurant and _______  _______  _______ (预订座位).

—Have you got any particular plans for the coming holiday?

—Yes._______, I’m going to visit some homes for the old in the city.

A．If ever

B．If possible

C．If busy

D．If anything

上颌KennedyⅠ类牙列缺损者可以采取单侧分别设计的病例是（）

A．

B．

C．

D．

E．

文氏管除尘器主要由哪三大部分组成？