题干

2003年,地球人制造的机器人成功登上火星,对火星进行科学探索,你知道火星有多大吗?火星半径是地球半径的一半,质量是地球质量的
1
9
.若地球半径为6370千米,质量是6×1027克,请你求出:
(1)火星的体积(体积公式为
4
3
πR3,取π的近似值为3);
(2)火星的质量(小数点后取两位).
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答案(点此获取答案解析)

解:(1)
4
3
πR3=
4
3
×3×63703=1033899412000 (立方千米).故火星的体积是10338

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阅读理解

    As a new driver with little experience behind the wheel, having to turn into another lane(车道)to avoid a careless driver talking on a cellphone is not something that I am prepared for. According to the New England Journal of Medicine, an accident is four times more likely to happen than normal while you are talking on the phone. Therefore, I hold the view that using a cellphone while driving should be outlawed(宣布……不合法).

    Cars are two-ton weapons and should be treated as such. When drivers put a key in the engine, they are taking on the responsibility of being a driver. Answer the phone while driving is like taking the safety off a gun ― at any moment something could go wrong and change a life forever.

    A few countries, including Australia, Great Britain, Spain and Israel, have recognized the damage that cellphone use can cause. According to Tom Alex of The Des Moines Register, people who talk on cellphones while driving are just like drunk drivers. They are likely to make a deadly mistake, causing them to hurt themselves or someone else.

    Some may think that cellphone are helpful when you need directions or are in an emergency situation. Although I agree, I believe the safest way to use your phone is to pull over to the side of the road first. Some may think that hands-free phones are less dangerous, but studies have shown that the danger remains the same with these.

    Using a cellphone while driving should be outlawed. One small mistake could change your whole life. Please don't let that happen ― stay off your cellphone while driving.