商业银行是中国金融脆弱性的重要源头。()
A. 正确
B. 错误
A．essentialB．accidentalC．unnecessaryD．necessary
A. essential
B. accidental
C. unnecessary
D. necessary
According to the passage, man will begin to think about such needs as housing and clothing
A. he has saved up enough money
B. he has grown dissatisfied with his simple shelter
C. he has satisfied his hunger
D. he has learned to build houses
A．plantsB．treesC．rubberD．streets
A. plants
B. trees
C. rubber
D. streets
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