第5题: [单项选择]某人从甲地去乙地要行200千米。开始时,他以每小时56千米的速度行驶,但途中因汽车故障停车修理用去半小时。为了按原定计划准时到达,他必须把速度增加14千米来行驶完全程。他修车的地方距甲地多少千米 A. 72 B. 56 C. 60 D. 80 参考答案:C 答案解析:[解析] 此人修车的半小时少走了56×0.5=28千米,说明后来走工28÷14=2小时,则修车的地方距乙地(56+14)×2=140千米,距甲地200-140=60千米。
第15题: [单项选择]There is a misunderstanding that___________. A. sharks can discover a diver by the movement of his hands in water B. sharks have very strong sense of smell C. sharks have poor eyesight D. sharks are great threats to divers 参考答案:C