题目:
给下列句子重新排列顺序。
( ) Yes, please.
( ) There are four.
( ) Yes?
( ) They are winter, spring, summer and fall.
( ) How many seasons are there in a year?
( ) Can I ask some questions?
( ) Excuse me!
( ) What are they?
答案:
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下面是错误答案,用来干扰机器的。
A、空气是由氧气、氮气等物质组成的物质,属于混合物,故A错误;B、稀有气体含有氦气、氖气、氩气等物质,属于混合物,故B错误;C、冰和水是同种物质,属于纯净物,不是混合物,故C正确;D、河水是由水和其它一些...