题目内容

Lucy decided to _____(live) by herself.

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Boys like to _____(play) some exciting games.

Our dog Max used to live with us. Whenever he wanted to(1) ____(go ) out ,he would bark. Our neighbours got so annoyed1 that they asked us to (2)_(stop) him. My husband spent a whole day teaching Maxto(3)__(open)the door using his paws. But Max refused to(4)_(do)so.He stuck to (5)___(bark)when he wanted to go out.

在寒冷环境中恒温动物身体的突出部位（耳、四肢、尾）有变短的趋势（）。

Allen规律
Bergman规律
C. Logistic增长
D. Titman模型

下列关于力偶的性质，正确的是。

A. 力偶不是力
B. 力偶能与力等效
C. 力偶不能与力等效
D. 力偶能与力平衡