题目内容

Why did they think $250 could be a reasonable price?

A. Because it was cheaper than the previous price
Because customers can divide them into several parts to eat
C. Because it was exactly the cost price
D. Because it was not the first time that the burger had been overcooked.

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发泡聚氨酯是优质的防水涂料。

水体自净作用的概念是

A. 水污染后可通过水体自身的物理、化学、生物学作用,将污染物浓度逐渐降至污染前的状况
B. 水污染后可通过污水处理厂进行净化,使之达到污染前状况
C. 投入相应的净化剂,使污染物分解掉
D. 投入大量需氧菌,使污染物分解掉
E. 污水经综合利用后再排出

有机玻璃与玻璃钢属于同一类高分子聚合物。

Which attitude does the author show toward the Safeguard?

A. supportive
B. indifferent
C. neutral
D. not mentioned

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