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问题 选择题

Is the maths problem ______? Yes, I can work it out ______. [ ]

A. easy, easily

B. easy, easy

C. easily, easy

D. easily, easily

答案

答案：A

选择题
I can hardly imagine Peter _____ across the Atlantic Ocean in five days.

A. sail
B. sailing
C. to sail
D. to have sailed
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填空题

一容器装满水后，容器和水的总质量为m1；若在容器内放一质量为m的小金属块A后再加满水，总质量为m2；若在容器内放一质量为m的小金属块A和一质量也为m的小金属块B后再加满水，总质量为m3，则金属块A和金属块B的密度之比为______．（用题目中所给出的符号表示）
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