情景选择。

1. 上学时间到了，应该说：[ ]

A. Time to go to school.

B. Time for dinner.

2. Mike从来不步行上学，应该翻译为：[ ]

A. Mike always walks to school.

B. Mike never walks to school.

3. 你想问同学是否经常骑自行车？应该问：[ ]

A. Do you sometimes ride a bicycle?

B. Do you usually ride a bicycle?

4. 你想告诉同学早餐你有时喝汤，你应该说：[ ]

A. Sometimes I eat soup.

B. Sometimes I eats soup.

5. 校车来了，你应该说：[ ]

A. Here comes the school bus.

B. There come the school bus.

换向阀的换向形式有哪几种（）

A.电磁换向

B.液压换向

C.手动换向

D.机动换向