一、完形填空。
When it comes to deserts, many people 1 huge dunes（沙丘）and dry weather. But a 2 in Brazil may change your mind. The desert is called Lencois Maranhenses. It is famous 3 its beautiful white dunes and green and blue lakes.
The desert's name is from Portuguese. It 4 means "bed sheets from Maranhão". Maranhão is the Brazilian state where the desert is.
5 dunes cover most areas of the desert, it is not dry there. The desert is close to the Amazon River and the place's rainy season can make a 6 to the weather in the desert. The desert can 7 enough rainfall from January to May. The 8 fill up the lakes between the dunes and make the place more amazing. Some of the lakes can be more than 90 metres long and 9 enough for swimming.
The desert is a dream place for 10 lovers. They can walk through the dunes, 11 in the lakes and even fly over the desert. It is also home to some special 12. They 13 some wild animals and endangered animals in Brazil.
The best time to go there is between June and September. The lakes reach 14 fullest then. From October the wind becomes 15 and there are far fewer lakes to visit.
()1. A. think over B. think back C. think up D. think of
()2. A. mountain B. desert C. river D. forest
()3. A. for B. to C. as D. with
()4. A. mainly B. easily C. differently D. seriously
()5. A. Because B. Unless C. But D. Although
()6. A. mistake B. plan C. difference D. decision
()7. A. lose B. waste C. watch D. get
()8. A. snow B. oil C. winds D. rains
()9. A. high B. deep C. thick D. thin
()10. A. nature B. music C. animal D. plant
()11. A. sleep B. run C. lie D. swim
()12. A. people B. animals C. sand D. plants
()13. A. save B. protect C. include D. know
()14. A. its B. their C. our D. your
()15. A. faster B. weaker C. stronger D. more

1.D 2.B 3.A 4.A 5.D 6.C 7.D 8.D 9.B 10.A 11.D 12.B 13.C 14.A 15.C

1. 考查动词短语辨析。think over意为“仔细考虑”，think back意为“回想”，think up意为“想出”，think of意为“想象”。此处指人们提到沙漠会想象沙丘，故选D。
2. 考查名词辨析。根据上下文主题围绕沙漠展开，此处指巴西的沙漠，故选B。
3. 考查固定搭配。be famous for是固定短语，意为“因……而著名”，符合语境，故选A。
4. 考查副词辨析。mainly意为“主要地”，easily意为“容易地”，differently意为“不同地”，seriously意为“严肃地”。此处指沙漠的名字主要意思是“来自马拉尼昂的床单”，故选A。
5. 考查连词辨析。前后句是让步关系，although意为“虽然”，引导让步状语从句，符合语境，故选D。
6. 考查固定搭配。make a difference是固定短语，意为“起作用，有影响”，此处指雨季对沙漠的天气有影响，故选C。
7. 考查动词辨析。lose意为“失去”，waste意为“浪费”，watch意为“观看”，get意为“获得”。此处指沙漠能获得足够的降雨量，故选D。
8. 考查名词辨析。根据前文提到的rainy season，可知是雨水填满沙丘间的湖泊，故选D。
9. 考查形容词辨析。high意为“高的”，deep意为“深的”，thick意为“厚的”，thin意为“薄的”。湖泊足够深才能游泳，故选B。
10. 考查名词辨析。nature意为“自然”，music意为“音乐”，animal意为“动物”，plant意为“植物”。沙漠是自然爱好者的梦想之地，故选A。
11. 考查动词辨析。sleep意为“睡觉”，run意为“跑”，lie意为“躺”，swim意为“游泳”。此处指在湖里游泳，故选D。
12. 考查名词辨析。根据后文提到的wild animals，可知沙漠是一些特殊动物的家园，故选B。
13. 考查动词辨析。save意为“拯救”，protect意为“保护”，include意为“包含”，know意为“知道”。此处指它们包含巴西的一些野生动物和濒危动物，故选C。
14. 考查代词辨析。指代前文的lakes，用形容词性物主代词its，故选A。
15. 考查形容词比较级。根据后文“there are far fewer lakes to visit”可知，从十月开始风变得更强，故选C。