【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.

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