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【单选题】
配制:pH=7的缓冲溶液,应选择的缓冲对是:A.
HAc－NaAc（pKa＝4.76）
B.
NaH2PO4－Na2HPO4（pKa＝7.21）
C.
NH3－NH4Cl（pKa＝9.24）
D.
Na2HPO4－Na3PO4（pKa＝12.7）
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【简答题】What can we conclude from the questions asked by the customs officer?
【单选题】What can we conclude from the text?
A.
Most people believe we think in symbols.
B.
Loving our own writing is scientifically reasonable.
C.
The writers and critics can never reach an agreement.
D.
Thinking and writing are different stages of mind at work.
【单选题】What can we conclude from the questions asked by the customs officer? 查看材料
A.
He was just doing his duty by asking the passenger some usual questions．
B.
He must have noticed the writer's ugly watch．
C.
He wanted to embarrass the writer．
D.
He must have noticed the walter' s tiredness．
【单选题】What can we conclude from this passage?
A.
Greeks and Romans significantly influenced European culture.
B.
The Greeks were the founders of democracy.
C.
The Greeks and Romans were bitter enemies.
D.
People of the classical world were barbaric and uneducated.
【单选题】What can we conclude from the passage?
A.
International contests are liable for misunderstanding between nations.
B.
Athletes should compete as individuals in the Olympic Games.
C.
Sport should be played competitively rather than for the love of Olympic Games.
D.
The organization of the Olympic Games has room for improvement.
【简答题】Concerning passports and visas, what can we conclude from this passage?
【单选题】What can we conclude from the last paragraph?
A.
Social responsibility is widely-acknowledged.
B.
Smokers ignoring social environment are self-centered.
C.
Going on smoking is wrong-headed.
D.
Social influence on smoking is double-edged.
【单选题】What can we conclude from the last paragraph? 查看材料
A.
Design course can help solve practical problems.
B.
Design courses are necessary to open.
C.
Design is strongly analytical.
D.
People don't pay attention to design courses.
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