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【多选题】
《中学数学思想方法》一书中谈到了类比在数学学习中的作用和意义的有A.
类比是数学发现和创新的一种方法
B.
类比是学习知识、系统地掌握知识和巩固知识的有效方法
C.
类比在解题中具有启迪思维的作用和意义
D.
类比有利于我们解决现实问题
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举一反三
【简答题】指出下列各对分子之间存在的分子间作用力的类型(取向力、诱导力、色散力和氢键)。 (1) CS 2 和 CCl 4 ; (2) HCl 和 HI ; (3) CH 3 Cl 和 CH 2 Cl 2 ; (4) H 2 O 和乙醇;
【单选题】--- Has your uncle ever been to Tibet ? ---___________________________.
A.
No, he didn't
B.
No, he haven't
C.
No, never
【单选题】Why is Robert not sure of joining the group?
A.
He hasn't practiced for ages.
B.
He doesn't have time to practice.
C.
He isn't interested in joining it.
【单选题】----Don’t look down upon Bob. He has his own advantage. --- Oh, yes. _______ others are weak, he is strong.
A.
If
B.
When
C.
Where
D.
Though
【单选题】______, he couldn't earn enough to support the family.
A.
Hard as he worked
B.
As he worked hard
C.
As hard he worked
D.
Hard as did he work
【单选题】— My father's just back from work, ? — . He is having a rest in the room. [ ]
A.
hasn't he; Yes, he has.
B.
has he; No, he hasn't.
C.
isn't he; Yes, he is.
D.
Is he; No, he isn't.
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