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【单选题】
治疗立克次体病用A.
广谱抗生素
B.
青霉素
C.
磺胺类药
D.
干扰素
E.
制霉菌素
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反馈参考答案：
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】----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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