题目

下列对物质结构的描述错误的是A.二氯甲烷只有1种结构可说明甲烷分子为正四面体结构B.二甲醚的结构简式:C2H5OC2H5C.CH4分子的比例模型:D.丙烯的结构简式:CH3CH=CH2 答案:【答案】B【解析】A.根据分子式,可推测CH4的空间结构只有平面正方形和正四面体两种可能,如果甲烷分子是平面正方形结构,二氯甲烷分子中两个氯原子可能相邻或相对,有两种结构,所以二氯甲烷只有1种结构说明甲烷分子是正四面体结构,故A正确;B.两分子甲醇通过分子间脱水生成二甲醚,二 听力 第一节:听小对话,请从A、B、C三个选项中选出符合对话内容的图片。 1.What is the boy's birthday present? A. B. C. 2.What is Kate's brother doing now? A. B. C. 3.What does this man probably to buy? A. B. C. 4.Where's Sam from ? A. B. C. 5.Who will go to the beach with Jenny? A. B. C. 第二节:听长对话,回答问题。 听下面一段较长的对话,回答第6至7两小题。 6.What day is coming soon? A.Mother's Day. B.Children's Day. C.Father's Day. 7.Who will help Frank wash the car? A.His sister. B.His brother. C.His friend. 听下面一段较长的对话,回答第8至10三小题。 8.What's the weather like today? A.It's sunny. B.It's rainy. C.It's windy. 9.When did Tina go to the space museum? A.Last year. B.This year. C.Last month. 10.How can they get to the museum? A.By bus. B.On foot. C.By subway. 第三节:听独白,请根据独白的内容,从题中所给的A、B、C三个选项中选择正确的选项,完成下面的表格。 11.A.Last Monday B.Last Wednesday C.Last weekend 12.A.classmates B.friends C.cousins 13.A.popular songs B.soft songs C.old songs 14.A.piano B.violin C.trumpet 15.A.jumped B.cried C.danced
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