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【单选题】
Man: I really enjoyed that TV special about spiders last night. Did you get home in time to see it? Woman: Oh, yes. But I wish I could have stayed awake long enough to see the whole thing. Question: What does the woman mean?A.
She missed the beginning of the program.
B.
She wishes she had gone to sleep earlier.
C.
She especially enjoyed the end of the program.
D.
She fell asleep before the program ended.
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【单选题】某主族元素R的原子其电子式可表示为： ．该元素组成的以下物质，其分子式肯定错误的是（ ）
A.
最高价氧化物分子式为R 2 O 5
B.
气态氢化物分子式为RH 5
C.
含氧酸分子式为H 3 RO 4
D.
含氧酸分子式为HRO 3
【单选题】某主族元素R的原子其电子式可用 表示。该元素组成的以下物质，分子式肯定错误的是
A.
最高价氧化物分子式为R 2 O 5
B.
含氧酸分子式为 HRO 3
C.
含氧酸分子式为H 3 RO 4
D.
气态氢化物分子式为RH 5
【简答题】充分燃烧2 mol某炔烃，消耗17 mol氧气.该炔烃的分子式是 .
【单选题】I disagree with the_____ that economic development has priority over the environment.
A.
promise
B.
premise
C.
preface
D.
demise
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