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【单选题】
某元素R的气态氢化物的化学式为H2R,则它的最高价氧化物对应的水化物的化学式为A.
H 2 R0 4
B.
H 3 R0 4
C.
H 2 R0 3
D.
H 2 R0 4
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举一反三
【单选题】The family were enjoying their dinner, so I was wondering if I had arrived at a/an ________ time. [ ]
A.
awkward
B.
prosperous
C.
flexible
D.
particular
【单选题】—That's a great dinner. ______. —Thanks, but it really only took an hour.
A.
I had never had it before!
B.
I enjoyed it very much.
C.
You must have spent all day cooking.
D.
Who cooked it?
【单选题】The ________of service in this restaurant has improved a lot since I last had a dinner with my friends there. [ ]
A.
method
B.
attitude
C.
quality
D.
cost
【简答题】认知主义者认为，世界是由客观实体、客观实体的特征及客观事物之间的联系组成的。（ ）
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