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  3. NASA is releasing several images taken by the Hubble Space Telescope, which is the closest yet look at the red planet. Altogethe

NASA is releasing several images taken by the Hubble Space Telescope, which is the closest yet look at the red planet. Altogethe

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问题     NASA is releasing several images taken by the Hubble Space Telescope, which is the closest yet look at the red planet. Altogether there are four images, which show the entire planet. Each view shows the planet as it completes one quarter of its daily rotation. In these views the north polar cap is turned toward the Earth and is clearly visible at the top of each picture. The images were taken in the middle of the Martian northern summer, when the polar cap was at its smallest size. During this season the Sun shines continuously on the polar cap. Previous spacecraft observations have shown that this summertime polar cap is composed of water ice, just like Earth’s polar caps.
    The Hubble Telescope pictures reveal that great changes have occurred on the surface of Mars in the past 20 years. The Martian surface is ever changing. Some regions that were dark 20 years ago are now bright red: some areas that were bright red are now dark. Winds move sand and dust from region to region, often in huge dust storms. Over long timescales many of the larger bright and dark markings remain stable, but smaller details come and go as they are covered and then uncovered by sand and dust.
When were the images of Mars taken?
选项 A、In the middle of summer on Earth.
B、In the middle of summer on Mars.
C、In the middle of summer on Earth’s polar caps.
D、In the middle of summer in the northern part of Mars.
答案D
解析 见第1段第5句(The images were taken in the middle of the Martian northernsummer，when the polar cap was at its smallest size．)。
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