Passage 2

Mars is the fourth planet from the Sun.For many centuries,Mars has also been called the“Red Planet”.Ancient Greeks and Romans thought of Mars as the god of war.Some people imagined that Mars was like the Earth and inhabited with many strange creatures.

Galileo was the first person to view Mars through a telescope.As telescopes improve,astronomers find that the red planet is about half as big as the Earth.From 1965 through 1972,the American Mariner series of robot spacecraft took many close-up television images of Mars.In 1976 two American spacecraft arrived on the Martian surface.Each carried two color television cameras,a 3-meter-long retractable(可伸缩的)arm,a small laboratory,and other instruments.They helped scientists discover exciting new knowledge about Mars.Mars is mostly a vast desert with immense mountains,extremely deep canyons,and enormous dust storms.Ice covers the Martian polar-regions,and buried ice exists in other areas.Some regions can get warm,but a-60℃is the average Martian temperature. Some scientists believe a global warming gas could be produced on Mars. This gas could help to warm the cold red planet and make it more like the Earth. The future is full of exciting changes,and some day Mars will have human explorers colonists,and tourists hiking across its surface.Maybe one of thesepeople will be you.

31.Which of the following is not true according to the passage?

A.Mars is like the Earth.

B.Strange creatures live on Mars.

C.Mars is also called the“Red Planet”.

D.Ancient Greeks believed Mars was the god of peace.

32.The Earth is about ________ Mars.

A.twice as big as

B.four times as big as

C.as big as

D.half as big as

33.You’ll find all the following on Mars EXCEPT ________.

A.dust storms

B.mountains

C.canyons

D.lakes

34.What do we know about Mas from the passage?

A.It’s cold on Mars.

B.It’s warm on Mars.

C.Ice exists everywhere.

D.Ice only exists in polar-regions.

35.Scientists believe a global warming gas could ________.

A.warm up the Earth

B.make Mars more like the Earth

C.discover knowledge about Mars

D.protect the environment on Mars