C. Mars is a frozen desert with no water.
D. Sending people to Mars is no easy job.3. What do you know about the climate of Mars?
A. Mars is very hot.
B. Mars is very mild.
C. Mars is very cool.
D. Mars is very cold.
4. We can infer that future residents on Mars ______.
A. have to wear spacesuits outdoors
B. don't have to wear spacesuits
C. can breathe the air freely on Mars
D. can get water from Mars' surface
5. At present, how many astronauts are living aboard the International Space Station?
A. Four.
B. Six.
C. Eight.
D. Twelve.
Ⅳ.阅读填空(每空不超过三个单词)
After experiencing heavy casualties(伤亡)and damage in powerful earthquakes since 2008, China is developing a way to give at least a few extra seconds' warning for those near quake epicenters(震中).
The system, called the National Earthquake Early Warning System, which will cost about 2 billion yuan, is expected to be built before 2017. The system mainly includes the construction of more than 5,000 quakemonitoring stations across the country.
The system works by detecting earthquakerelated shakings in the form of Pwaves. Pwaves move rapidly but are harmless, and they arrive before the more powerful and destructive Swaves. Swaves travel more slowly. So detecting Pwaves with the system can provide a few precious seconds for people to escape before the more powerful Swaves arrive.
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