【解析】从题干可知答案出现在Storage of Study Material中，根据when you have obtained at least 40 credits, you may rent a locker…可知答案为D。

　　40.【答案】D

　　【解析】根据文中Keep your phone on silent可知mobile phones是可以带进来的。

　　B

　　Deserts are found where there is little rainfall or where rain for a whole year falls in only a few weeks' time. Ten inches of rain may be enough for many plants to survive (存活)if the rain is

　　spread throughout the year, If it falls, within one or two months and the rest of the year is dry, those plants may die and a desert may form.

　　Sand begins as tiny pieces of rock that get smaller and smaller as wind and weather wear them down. Sand dunes (沙丘) are formed as winds move the sand across the desert. Bit by bit, the

　　dunes grow over the years, always moving with the winds and changing the shape. Most of them are only a few feet tall, but they can grow to be several hundred feet high.

　　There is, however, much more to a desert than sand. In the deserts of the southwestern United States, cliffs (悬崖) and deep valleys were formed from thick mud that once lay beneath a sea more than millions of years ago. Over the centuries, the water dried up. Wind, sand , rain, heat and cold all wore away at the remaining rocks. The faces of the desert mountains are always changing –-very, very slowly ---as these forces of nature continue to work on the rock.

【2017高考英语三轮复习回归基础训练Unit6 北师大版】相关文章：

★ 【优化方案】2017届高考英语二轮复习全国卷Ⅱ题型重组训练：第20组（含解析）

★ 2014高考英语（新人教版）一轮基础训练（19）A、B卷（附答案或解析）

★ 【北京专用】2014届高考英语一轮复习方案课时作业：必修3 Unit 5 Canada

★ 2014届高考英语一轮复习课时作业(三十八)选修7Module 2《Highlights of My Senior Year》（外研版）

★ 【北京专用】2014届高考英语一轮复习方案课时作业：选修6 Unit 2 Poems

★ 2017高考四川省广安市英语阅读理解一轮系列训练：12（含解析）

★ 备战2016高考一轮英语复习必须要依托课本

★ 【北京专用】2014届高考英语一轮复习方案课时作业：必修2 Unit 1 Cultural relics

★ 【人教版】2014届高考英语一轮复习指导考点针对练：选修6 unit1《Art》

★ 重庆市2014高考英语阅读理解一轮（精品）训练题（11）附答案