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【单选题】
下列关于物质的组成、结构与性质的说法不正确的是A.
生铁和钢的性质不同，是由于含碳量不同
B.
金属钠和镁的性质不同，是由于他们的原子结构不同
C.
金刚石和石墨的物理性质不同，是由于所含元素不同
D.
CO和CO2的性质不同，是由于它们的分子构成不同
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【简答题】Trees are useful to man in three very important ways. The first important way is that they provide man with food，wood and other products. Trees provide man and animals with food to live on the earth. ...
【简答题】Hear to me carefully. What I‘m saying is very important.
【简答题】Trees are useful to man in three very important ways. The first important way is that they provide man with food, wood and other products. Trees provide not only man with food, but also many animals w...
【单选题】听力原文：M: Linda, there are many important guests tonight. W: Why? M: To tell the truth, today is tile 30th anniversary of the wedding for our parents. W: Really? I don't know. M: What are we going to se...
A.
Because today is the 30th anniversary of the wedding for their parents.
B.
Because today is their mother's birthday.
C.
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