Scientists who have compared pictures of Mars taken by satellites in the 1970s
to images taken more recently have noticed that the Red Planet’s surface looks different than it used to. In some areas, the landscape looks much darker, while in others, it looks lighter. On the whole, the surface of Mars—especially in the planet’s southern hemisphere—has grown darker over the past 30 years.
Most of those changes probably occurred because Martian winds blew away light-colored dust that had covered many regions. That exposed darker rocks that had been covered with dust.
The darkening of Mars has caused the planet to get warmer, a new study suggests.
Scientists calculated how much more sunlight and heat Mars absorbs now. They compared that to how much it absorbed in the late 1970s.They estimate that the planet’ s atmosphere is almost 1℃ warmer, on average, than it was 30years ago. Some areas of mars have warmed more than average. For example, the planet’s south pole may be 4℃ warmer than it was in the late 1970s.
55. 30 years ago, the surface of Mars looked________.
A. lighter
B. darker
C. as dark as it is now
D. as light as it is now
56. What is the main cause of climate change on Mars?
A. Increases in the sun’s radiation.
B. Increases in heat Mars absorbs.
【2016年浙江省杭州市外国语学校高考英语(阅读理解提分训练)每日一练32】相关文章:
★ 浙江省湖州市2014高考英语阅读理解一轮(暑假)精炼(19)含答案
★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (33)
★ 2017高考四川省广安市英语阅读理解一轮系列训练:18(含解析)
★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (36)
★ 浙江省湖州市2014高考英语阅读理解一轮(暑假)精炼(1)含答案
★ 重庆市2014高考英语阅读理解一轮(精品)训练题(18)附答案
★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (3)
★ 浙江省湖州市2014高考英语阅读理解一轮(暑假)精炼(8)含答案
★ 重庆市2014高考英语阅读理解一轮(精品)训练题(1)附答案
★ 重庆市2014高考英语阅读理解一轮(精品)训练题(11)附答案
最新
2017-04-24
2017-04-24
2017-04-24
2017-04-24
2017-04-21
2017-04-21