从牙体表面观察属于牙体组成的是A．牙釉质B．牙骨质C．牙本质D．牙冠E．牙髓

Our factory has been developing rapidly these days． This year’s production is five times ______ it was ten years ago．

A．what

B． that

C．which

D．as

根据汉语提示完成英语句子。

1. The movie was too broing.

    I                           (睡着) half way through it.

2. These books will                                           (赠送) to children.

3. The gift he bought is                                            (不够特别).

4. Have you ever                              (听说) the Beijing Speaks English

5. A baby dog is too difficult to                                            (照顾).

6. We should try to                             (取得进步) before the test.

以下疾病多引起象限性视野缺损的是（）

A.视 * * 水肿

B.球后视神经炎

C.假性视神经炎

D.视 * * 炎

E.缺血性视神经病变

接种（）疫苗是最有效预防肺结核病的措施之一。

A、麻疹疫苗

B、乙肝疫苗

C、卡介苗

D、乙脑疫苗