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儿童热能消耗主要有几方面？

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想一想，为什么成年人一般吃三餐即可，幼儿在幼儿园要吃三餐两点？

Activity 2Fill in the blanks with the proper form of words given in the brackets.1. There have been calls for a new kind of security _(arrange).2. We were most impressed with your (efficient).3. The manager spoke to them all (individual).4. The Chinese people maintain a strong cultural(traditional).5. Keep your office space looking good, ____(particular) your desk.

Activity 3Grammar: Fill in the blanks with the proper form of words given in the brackets.1. The man (stand) at the gate is my English teacher.2. They live in a room (face) the south.3. The girl (sit) under the tree is really charming.4. There are a few boys (swim) in the river.5. A man (live) in the village rarely sees subways.

设计时有两种方法可以减小凸轮机构的压力角：。