题目内容

There are very few perfect synonyms in a language.

A. 对
B. 错

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Dry and wet are a pair of gradable antonyms.

A. 对
B. 错

The reference theory is not suitable for a. prep. and conj.

A. 对
B. 错

“Dog”is the superordinate of “animal”.

A. 对
B. 错

平面问题的应力状态只有个独立应力分量。（填阿拉伯数字）