There are many trees on _______ sides of the road.[ ]
A. each
B. every
C. both
D. all
答案:C
The moment the 28th Olympic Games _______ open, the whole world cheered. [ ]
A. declared
B. have been declared
C. have declared
D. were declared
易燃液体闪点的高低与()有关。
A.物质本身品质
B.外界温度
C.测定闪点的仪器
D.A和C