Question

 Mars is the fourth planet from the sun. It is 141 million miles away from the sun. A year on Mars is 687 Earth-days long. One day is about the same as on Earth： 24. 25 hours long.

  Mars is about half the size of Earth. Because Mars is smaller than Earth，its gravity is also less. If you weighed 100 pounds on Earth, you'd weigh about 38 pounds on Mars.

  Mars' surface looks like a red desert. There are mountains, canyons(峡谷).and volcanoes (火山)and so on. It is a dry planet without any liquid water(液态水).It does have ice caps at its north and south. Some of this ice is frozen(冻结的)carbon dioxide.

  Evidence shows that Mars once had rivers, streams, lakes, and maybe even an ocean. Scientists guess that there once was water on the surface of Mars that created these. Today the only water on Mars is either frozen in the ice caps or underground.

  Mars has mountains that are much higher than the mountains on Earth. Olympus Mons, the biggest volcano in the whole solar system， stands 17 miles tall！Mars also has bigger, deeper canyons than Earth's. Some of these are sixty miles long and five or six miles deep. How amazing！

根据短文内容，选择最佳答案。

(   ) 1. How long is the time of a year on Mars?

A.   About one year on Earth.

B.   About two years on Earth.

C.   About three years on Earth.

D.   About four years on Earth.

(   ) 2. According to the passage, the gravity on Mars is about       as strong as

it's on Earth.

A. four fifths    B. three fifths

C. two fifths    D. one fifth

(   ) 3. What does the surface of Mars look like?

A.   A red desert.

B.   Liquid water.

C.   The surface of Earth.

D.   The surface of the ocean.

(   ) 4. What's the meaning of the underlined word " evidence"？
A.材料          B.起源

C.清单          D.迹象

(   ) 5. What's the best title of the passage？

A.   The Earth is Different from Mars

B.   The Fourth Planet from the Sun

C.   Olympus Mons on Mars

D.   The Gravity on Mars

Answer 1

1. B由第一段第三句可知，火星上的一年大约是地球上的687天，即大约两年。

2. C   由第二段内容可知，火星上的重力大约是地球上重力的五分之二。

3. A    由第三段第一句可知，火星表面看起来像一片红色的沙漠。

4. D    由此句后面科学家的猜想可推断"迹象"更接近本句句意。

5. B本文主要介绍了火星的一些情况。