问题
选择题
下列表达方式正确的是( ) A.CCl4的电子式: B.MgCl2的电子式: C.S2-的结构示意图 D.中子数为20的氯原子:20Cl |
答案
答案:C
下列表达方式正确的是( ) A.CCl4的电子式: B.MgCl2的电子式: C.S2-的结构示意图 D.中子数为20的氯原子:20Cl |
答案:C
完形填空 | ||||
There are about fifteen hundred languages in the worl![]() The only language that seems easy to learn is the mother tongue. We should 12 that we all learned our own language well when we were 13 . If we could learn English in the same way, it would not seem so difficult. 14 what a small child does. He listens to what people say. He tries what he hears. When he is using the language, talking in it, 15 in it all the time. Just imagine how much 6 that gets! So it is 17 to say that learning English is easy, because a go ![]() | ||||
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