题目

如图是A、B两种物质的质量m与体积V的关系图像。由图可知，A、B两种物质的密度ρA、ρB和水的密度ρ水之间的关系是（ ）A. ρA＞ρB＞ρ水 B. ρA＞ρ水＞ρBC. ρB＞ρA＞ρ水 D. ρ水＞ρA＞ρB 答案：【答案】B【解析】由图象可知，当VA＝VB时，mA＞mB，所以ρA＞ρB；由A、B两种物质的质量m与体积V的关系图象可知，当体积v＝20cm3时A的质量是30g，B的质量是5g；由ρ＝可得：ρA＝＝1.5g/cm3>ρ水，ρB＝＝0.25g/cm3<ρ水，故ρA>ρ水>ρB；由以上计算过程知A、C、D不符合题意，B符合题意。故选B。阅读短文，从方框中选择适当的单词填空（每词限用一次）。on and ten cake readyMrs. Brown is going to give her daughter, Ann, a birthday party. Ann will be (1) ___ years old. A lot of her friends will come to the party. Mrs. Brown is preparing for the party. Mrs. White is helping her.＂That’s a nice (2) ___ ,＂ says Mrs. White.＂Yes,＂ says Mrs. Brown, ＂And I bought some pears, apples, oranges (3) _____ bananas yesterday. The children like fruit.＂ They put the fruit (4) ______ the table.It’s five o’clock in the afternoon. Everything is (5) ___ . Now the first girl is arriving.The party will begin in half an hour.