题干

如图所示,将同一枚新鲜鸡蛋分别浸入盛有水和盐水的容器中,静置一会儿,出现如图所示的现象.下列说法正确的是(   )

A:水的密度比鸡蛋的密度大

B:左图中鸡蛋对杯底一定有压力

C:两种情况下鸡蛋所受的浮力相等

D:往浓盐水中再加一些盐,鸡蛋静止后所受的浮力比原来的大

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答案(点此获取答案解析)

B

同类题1

阅读下面短文,掌握其大意,然后从各题所给的A、B、C和D项中,选出最佳选项。

    A group of frogs were jumping through the woods when two of them fell into a big hole. All of the other frogs gathered around the 1  to see what could be done to help their friends.

    When they saw how 2  the hole was, the rest of the group agreed that itwas 3 for the two frogs to get out of the hole. In the beginning, the two frogs 4  with all their strength. Some of the frogs shouted into the hole that is was hopeless, just prepare for the fate(命运), others  5shouted that they two should save their energy and give up. But the two frogs continued jumping as 6as they could, and after several hours of hopeless jump they were quite tired.

    At that moment, one of the frogs gave up. He lay down at the7of the hole, and died as the others looked on his helpless sadness. However, the other frog8to jump with every bit of energy he has, even though he was completely worn out. His friends began a new shouting to him to accept his fate, waiting to die. But the frog jumped harder and harder. Finally he jumped so 9that he got out of the hole.

    The other frogs asked him surprisingly, “Why did you continue jumping when we told you it was impossible?” Reading their lips(嘴唇), the amazed frog explained to them that he was10and when he saw their gestures and shouting, he thought they were cheering him up, so he tried harder and finally succeeded.