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【简答题】
棱长为1的正方体ABCD-A 1 B 1 C 1 D 1 的8个顶点都在球O的表面上,若棱AA 1 ,DD 1 的中点分别为E,F,则直线EF被球O截得的弦长为 .
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举一反三
【单选题】下列选项中,加点通假字有误的一项是 ( )
A.
士之耽兮,犹可 说 也(同 “脱”)
B.
于 嗟鸠兮(同 “吁”),无食桑葚
C.
淇则有岸,隰则有 泮 (同 “畔”)
D.
匪来贸丝,来即我 谋 (同 “媒”)
【简答题】听句子,选出该句的最佳答语。 (     )1. A. They're over there. (     )2. A. You're welcome. (     )3. A. How are you? (     )4. A. Yes, they do. (     )5. A. Have you seen him? B. No, it isn’t. B. I’m sorry to hear ...
【简答题】补全对话。注意有两项是多余的选项。 A. But you mustn’t write it in bed. B. What was wrong with you? C. May I speak to Mr. Wang? D. But you mustn’t read in bed. E. May I come in? F. Are you better now? G. it’s you, Li P...
【单选题】–I won the first prize in English Writing Competition. --_____________.
A.
I’m sorry to hear that.
B.
You’re welcome.
C.
Thank you.
D.
Congratulations!
【单选题】社区获得性肺炎的主要病原菌是
A.
葡萄球菌
B.
肺炎链球菌
C.
铜绿假单胞菌
D.
肺炎球菌
E.
支原体
【单选题】社区获得性肺炎的主要病原菌是
A.
葡萄球菌
B.
肺炎链球菌
C.
肺炎球菌
D.
支原体
【单选题】---You’d better read more English magazines to improve your reading. ---______________
A.
Why don’t you read it?       
B.
That’s a good idea.
C.
Can I help you?           
D.
I’m sorry to hear that.
【单选题】3,3,3-三氟丙烯 与HCl 反应,产物是( )
A.
1,1,1-三氟-1-氯丙烯
B.
3,3,3-三氟-1-氯丙烷
C.
1,1,1-三氟-2-氯丙烷
D.
1,1,1-三氟-3-氯丙烷
【单选题】3,3,3-三氟丙烯 与HCl 反应,产物是( )
A.
1,1,1-三氟丙烯-1-氯丙烯
B.
3,3,3-三氟丙烯-1-氯丙烷
C.
1,1,1-三氟丙烯-2-氯丙烷
D.
1,1,1-三氟丙烯-3-氯丙烷
【单选题】—This is a really wonderful party with interesting people and great food . —I’m _____ to hear that you are enjoying yourself. [     ]
A.
sorry
B.
glad
C.
afraid
D.
sure
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