Please don't ________ English in Chinese class.[ ]
A. speak
B. say
C. talk
答案：A
It is re ported that the United States uses _____ energy as the whole of Europe.
A．as twice
B．twice much
C．twice much as
D．twice as much
地下水对混凝土会发生溶出型侵蚀，通过反应带走()而损害混凝土。
A．CaSO4
B．Ca (OH)2
C．Ca (HCO3)2
D．CaCO3
