问题补充：
What’s the red star in the sky through a telescope(望远镜)? It is Mars. Do you want to know more about it? Take the “Mars Orbit Express”!
“Mars Orbit Express” is a space probe (探测器). It was sent towards Mars by American scientists on August 12th，. Its tasks are to study Mars’ atmosphere and return photos to Earth. But before that “Mars Orbit Express” must travel about 100 hundred million kilometers and seven months. It reached Mars’ orbit(轨道)in March，.
Mars and Earth have similar weight and size. However，Mars is closer to the sun than Earth. Mars is very cold. The average temperature is below 50℃. The temperature at noon only reaches 20℃ during a Mars day. Its atmosphere is mostly CO2. It has much sand and two moons---Phobos and Deimos.
Scientists think Earth and Mars had similar beginnings 4.6 billion years ago. But while Earth supports millions of lives，Mars becomes bad. “Earth easily could have turned out like that.” said an scientist, “It is important for us to find out why and Mars Orbit Express’ should do that.” “Mars Orbit Express” also would help scientists to learn what might happen to Earth in the future. “Mars Orbit Express” would work for about four years.
【小题1】 What can you see through a telescope when watching Mars? .A．Much sandB．A red starC．Its atmosphereD．Its size【小题2】One of the tasks of Mars Orbit Express is . A．taking pictures of MarsB．studying the weight of MarsC．finding out distance between Earth and MarsD．telling the time it takes to go from Earth to Mars【小题3】Compared with Earth，.A．Mars has a long historyB．Mars is big and heavyC．Mars is close to the sunD．Mars’ atmosphere is mainly O2.【小题4】 Which might be the proper title for the passage?A．Mars：differences from EarthB．A probe：to learn more about MarsC．Mars: change of temperatureD．A probe：to tell the future of EarthB
答案：
(答案→)B
解析：
【小题1】根据What’s the red star in the sky through a telescope(望远镜)? It is Mars.可知选B。
【小题1】根据Its tasks are to study Mars’ atmosphere and return photos to Earth. 可知选A。
【小题1】根据However，Mars is closer to the sun than Earth.描述可知选C。
【小题1】根据“Mars Orbit Express” is a space probe (探测器).及短文描述可知本文主要是讲述探索火星的故事，故选B。
