人教版（新课程标准） 必修3 Unit 4 Astronomy the science of the stars课时作业word版含解析（3份打包）.zip

课时分层作业(十)　Section Ⅰ
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Ⅰ.阅读理解
A
There are strong arguments on space travel，and below you will find a list of many frequently used arguments.
Pros of space travel：
—Space travel has inspired many people to continue improving technology such as inventing Velcro and non­stick frying pans.
—If you look at the total GDP worldwide，space only accounts for a very small percentage of the total budget.
—Better to spend money on our future，than on other projects that would have a much lower potential reward.
—If we were to colonize (占领) another planet，it would reduce the population on Earth，which is already overpopulated.This will result in the survival of our species when our planet can no longer support human life.
—Multinational space stations have helped diplomacy (外交) among multiple nations.
Cons of space travel：
—There is a very large percentage of the earth's oceans we have yet to explore.We should continue exploring the remaining unknown regions of our oceans before continuing to another planet.
—The funding for space exploration comes from the tax payers' pockets.Many do not think that they should be forced into paying for something they oppose.
—The total contributions from space travel is minimal，when considering the total cost.
—We should not be thinking about colonizing a moon，or a planet.It's better to save our existing planet first.If we are to