B. House-moving companies are busy because their houses are in danger.
C. To stop permafrost melting is a very difficult problem.
D. Most of Alaska’s land surface has permafrost.
【参考答案】21.BADB
阅读理解
Rivers may be a significant source of the greenhouse gas nitrous oxide (一氧化二氮), scientists now find.
Their calculation suggests that across the globe the waterways contribute three times the amount of nitrous oxide to the atmosphere as had been estimated by the International Panel on Climate Change (IPCC), the United Nations scientific body charged with reviewing climate change research. They found that the amount of nitrous oxide produced in streams is related to human activities that release nitrogen (氮) into the environment, such as fertilizer use and sewage discharges.
“Human activities, including fossil fuel combustion and intensive agriculture, have increased the availability of nitrogen in the environment,” said Jake Beaulieu of the University of Notre Dame and the U.S. Environmental Protection Agency in Cincinnati, Ohio, and lead author of the paper published this week in the journal Proceedings of the National Academy of Sciences.
“Much of this nitrogen is transported into river and stream networks,” Beaulieu said. There, microbes (微生物) convert the nitrogen into nitrous oxide (also called laughing gas) and an inert gas called dinitrogen (二氮).
【2017届全国高考英语短文改错及阅读理解训练(6)】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(13)含答案
★ 浙江省湖州市2014高考英语阅读理解一轮(暑假)精炼(16)含答案
★ 贵州省贵阳市2014高考英语(新人教版)一轮阅读训练(39)附答案
★ 贵州省贵阳市2014高考英语(新人教版)一轮阅读训练(34)附答案
★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (44)
★ 2017高考四川省广安市英语阅读理解一轮系列训练:30(含解析)
★ 【三维设计】2017届高考英语(江苏专用)二轮复习阅读理解解题技法示范课件:2
★ 2017届高考英语二轮复习书面表达限时测验:1(含解析)
★ 湖南省岳阳市2014高考英语一轮单项选择训练题(13)及答案
最新
2017-04-24
2017-04-24
2017-04-24
2017-04-24
2017-04-21
2017-04-21