(
A. Because spacecraft couldn't work on Mars.
B. Because humans could work faster and smarter than machines.
C. Because scientists have worked out how to survive on Mars.
D. Because space travel is always free of danger for astronauts.
(
A. A few days.
B. At least six weeks.
C. At least six months.
D. Less than half a year.
(
A. A trip to the Moon would be the farthest journey in human history.
B. Space radiation might raise the risk of health problems for astronauts.
C. Taking certain vitamins can help reduce pressure behind the eyes in space.
D. Astronauts don't have to pack light to lift off from the Earth in the last 60 years.
(
A. Mars astronauts will be able to get things they need
B. Mars astronauts can grow lettuce and other food now
C. 3-D printing techniques could allow astronauts to build tools as needed
D. astronauts could develop 3-D printing techniques on Mars in the future
(
A. surviving a trip to Mars
B. spacecraft landing on Mars
C. health problems of astronauts
D. dangers of getting to Mars
B
) 6. Why do many countries want to send astronauts to Mars?A. Because spacecraft couldn't work on Mars.
B. Because humans could work faster and smarter than machines.
C. Because scientists have worked out how to survive on Mars.
D. Because space travel is always free of danger for astronauts.
(
C
) 7. How long would it take astronauts to reach Mars?A. A few days.
B. At least six weeks.
C. At least six months.
D. Less than half a year.
(
B
) 8. According to the passage, which of the following is TRUE?A. A trip to the Moon would be the farthest journey in human history.
B. Space radiation might raise the risk of health problems for astronauts.
C. Taking certain vitamins can help reduce pressure behind the eyes in space.
D. Astronauts don't have to pack light to lift off from the Earth in the last 60 years.
(
C
) 9. In the last paragraph, the writer implies(暗示) that ______.A. Mars astronauts will be able to get things they need
B. Mars astronauts can grow lettuce and other food now
C. 3-D printing techniques could allow astronauts to build tools as needed
D. astronauts could develop 3-D printing techniques on Mars in the future
(
A
) 10. The passage is mainly about ______.A. surviving a trip to Mars
B. spacecraft landing on Mars
C. health problems of astronauts
D. dangers of getting to Mars
答案：【解析】：
这是一道英语阅读理解题，主要考查学生对文章内容的理解和分析能力。题目给出了一个关于火星旅行的阅读材料，并附带了几个问题。学生需要通过阅读文章内容，理解文章的主旨和细节，然后根据文章内容选择正确的答案。
1. 对于第6题，需要理解各国想要送宇航员到火星的原因。文章中提到“humans could work faster and smarter than machines.”，即人类比机器工作得更快、更聪明，这是各国想要送宇航员到火星的原因。
2. 对于第7题，需要找到宇航员到达火星所需的时间。文章中明确提到“so it would take astronauts at least six months to reach there.”，即宇航员至少需要六个月才能到达火星。
3. 对于第8题，需要判断哪个选项是正确的。根据文章内容，“space radiation might raise the risk of health problems for astronauts.”是正确的，因为文章中明确提到了太空辐射可能会增加宇航员的健康风险。
4. 对于第9题，需要理解文章最后一段的含义。文章最后一段提到工程师们正在开发3-D打印技术，这项技术可以让未来的火星宇航员根据需要制造工具，这是对未来火星生活的一个暗示。
5. 对于第10题，需要理解文章的主旨。文章主要讨论了在火星旅行中如何保持人们的生命安全，因此选项A“surviving a trip to Mars”是正确的。
【答案】：
6. B
7. C
8. B
9. C
10. A
这是一道英语阅读理解题，主要考查学生对文章内容的理解和分析能力。题目给出了一个关于火星旅行的阅读材料，并附带了几个问题。学生需要通过阅读文章内容，理解文章的主旨和细节，然后根据文章内容选择正确的答案。
1. 对于第6题，需要理解各国想要送宇航员到火星的原因。文章中提到“humans could work faster and smarter than machines.”，即人类比机器工作得更快、更聪明，这是各国想要送宇航员到火星的原因。
2. 对于第7题，需要找到宇航员到达火星所需的时间。文章中明确提到“so it would take astronauts at least six months to reach there.”，即宇航员至少需要六个月才能到达火星。
3. 对于第8题，需要判断哪个选项是正确的。根据文章内容，“space radiation might raise the risk of health problems for astronauts.”是正确的，因为文章中明确提到了太空辐射可能会增加宇航员的健康风险。
4. 对于第9题，需要理解文章最后一段的含义。文章最后一段提到工程师们正在开发3-D打印技术，这项技术可以让未来的火星宇航员根据需要制造工具，这是对未来火星生活的一个暗示。
5. 对于第10题，需要理解文章的主旨。文章主要讨论了在火星旅行中如何保持人们的生命安全，因此选项A“surviving a trip to Mars”是正确的。
【答案】：
6. B
7. C
8. B
9. C
10. A