从人的消化道中取出一些内容物，经化验有淀粉、纤维素、蛋白质、多肽（蛋白质初步消化

根据短文内容完成句子

       Look at the picture on the blackboard. We can see a house in it. Behind the house there is a hill with many trees. Near the hill we an see a river. There are three boats in the river, One is blue, the other two

are yellow. There are some Young Pioneers in those boats. Near the house we can see a big tree. Under

the tree there is a small bus. It’s a white bus.

1. There is a _____ on the _____.

2. Can you see a house _____ a room in the picture? A _____.

3. _____ is the hill? It’s _____ the house.

4. Are there any trees on the hill? _____, there are _____ trees on it.

5. There _____ three _____ in the river.

6. One is _____ the other two are ____.

7. Who are in the boats? Some _____ _____ are in them.

8. Is there a small bus in the picture? _____, there _____.

9. Where is it? It’s _____ the big _____.

— No one answered when I phoned this morning. Where were you?

— I         for teeth in the dental clinic.

A．was being treated

B．have been treated

C．was treated

D．treated

液化石油气在常温下即可蒸发汽化，用于汽车发动机时，必须使用（）。

A、化油器

B、蒸发器

C、喷油器

D、调压器

Ⅲ类手持式电动工具安全电压电源来自安全隔离变压器，必须采用双圈变压器，禁止使用自耦变压器．

从安全上考虑，在钩一罗拉缠丝过程中（）不能随意摆放在生头小车上。

A、生头杆

B、剥丝器

C、筒管

D、钩刀