题目内容

How do animals like mice adapt to the severe winter?

A. By staying in hiding places and eating very little.
By seeking food and shelter in people’s houses.
C. By growing thicker hair to stay warm.
D. By storing enough food beforehand.

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Why do some birds fly in groups for migrating according to the speaker?

A. To stay safe.
B. To save energy.
C. To keep company.
D. To protect the young.

What is the main idea of this passage?

蒙皮拉形的优点主要有____。

A. 模具构造简单
B. 零件表面质量好
C. 成形准确度高
D. 效率高

____是将毛料的两端夹紧，利用专用凸模上顶，使毛料产生不均匀的拉应变而与模具贴合。