题型:阅读理解 题类:常考题 难易度:普通
黑龙江省鹤岗市第一中学2018-2019学年高一上学期英语12月月考试卷
It is easier to float in the ocean than it is to float in a swimming pool. Do you know why?
Ocean water is full of salt— and salt water can hold up more weight than fresh water. See for yourself!
You Will Need:
3 cups of warm water
Measuring cup (量杯)
Wide-mouthed jar
Salt
Spoon
Raw (生的)potato
You Will Do:
⒈Pour 1.5 cups of warm water into the jar.
⒉Add 1/3 cup of salt.
⒊Stir(搅拌) until the salt is completely dissolved.
⒋Add another 1.5 cups of water. Pour it slowly over the back of the spoon into the jar so that the two liquids will not mix together.
⒌Gently place the potato into the jar. Do not drop it.
What Will Happen:
The potato will sink— but only halfway!
Why?
Salt water is heavier than fresh water, so it will stay on the bottom. The fresh water will remain on top.
The potato is heavier than the fresh water, but it is lighter than the salt water. That is why the potato will sink halfway down.
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