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【单选题】
已知HAc的pKa=4.76,若将HAc溶液与等体积的NaAc溶液相混合,欲使混合溶液的pH值为4.34,混合后酸和盐的浓度比应近似为( )。A.
5:1
B.
2:3
C.
4:1
D.
5:2
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【简答题】The Short Board 短板 Write an essay of 160-200 words based on the drawing. In your essay, you should 1)describe the drawing briefly, 2)explain its intended meaning, and 3)give your comments.
【单选题】It is possible that most of the readers of the four magazines are ______.
A.
men
B.
women
C.
children
D.
grown-ups
【简答题】A．An essay, B．A magazine article C．A poem. D．A short story.
【单选题】The first time I saw him, what impressed me most were his waistline _____ nearly 3 Chinese chi and his obesity ______ 210 jin.
A.
measured ; weighed
B.
measuring; weighing
C.
measured; weighing
D.
measuring; weighed
【简答题】听力原文：Who like Fantasyland most? Who like Fantasyland most? Probably Fantasyland is the most enjoyable for ______
【单选题】According to some scientists, what kind of people can benefit most from Tai Chi?
A.
Healthy but relatively inactive old people.
B.
Active but relatively unhealthy old people.
C.
Frail old people, just released from hospital.
D.
Energetic young people.
【单选题】__________is known to all, Peking University is one of the most famous universities in China.
A.
It
B.
As
C.
What
D.
That
【简答题】Directions: For this part, you are allowed 30 minutes to write a short essay on innovation. Your essay should include the importance of innovation and measures to be taken to encourage innovation. You...
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