给棉刺辊部分主要机件有（）、给棉板、给棉罗拉、分梳板、刺辊、除尘刀、小漏底等。

用所给动词的正确形式填空。

1. We know the earth _____ (travel) around the sun.

2. Can you see the students _____ (plant) trees on the hill now?

3. —Where's your father?

    —He _____ (clean) the car behind the house.

4. I am sure she _____ (be) a very good teacher in a few years.

5. He wanted my help. So I stopped _____ (help) him.

6. Was Jane very busy _____ (plan) a boat trip with you last night?

7. It is very important _____ (not give) your goldfish too much food.

8. The boss usually makes his workers _____ (work) for twelve hours every day.

9. David _____ (fall) off the tree and hurt his legs a moment ago.

10. Millie, _____ (not frighten) the dog, or it will bark at you.

关于空天飞机发射操作费用说法有误的一项是：

A．是运载火箭发射费用的三分之一

B．是大型航天飞机费用的五分之一

C．是火箭发射小型航天飞机的费用的10%-30%

D．完成任务各项成本较低，效益较高

知道如何解剖动物属于陈述性知识。

额的宽度长于面部长度的1/3时，额显得很（）。

A.宽

B.狭

C.长

D.短