题目内容

【题目】 黄土高原是我国水土流失最严重的地区,黄土高原的土地总面约为53方平方千米,其流失面积大约43万平方千米,其中严重流失区约有25万平方千米。这里地面支离破碎,生产条件差。彻底治理黄土高原,是我国紧迫而艰巨的任务。

据此完成下列各题。

1黄土高原水土流失严重的人为原因是( )

A.气候干旱,沙丘向南迁移B.地面径流量少,降水集中多暴雨,流水侵蚀严重

C.黄土土质疏松D.人们违反自然规律,不合理地利用土地

2黄土高原的地表特征是( )

A.地表崎岖,典型的喀斯特地形B.雪山连绵,冰川广布

C.一望无际D.千沟万壑,支离破碎

【答案】

1D

2D

【解析】

1黄土高原水土流失严重的原因:自然原因:①季风气候降水集中,多暴雨;②黄土土质疏松;人为原因:①过度放牧和过度砍伐,造成植被的破坏;②不合理的耕作制度(轮荒);③开矿等;D符合题意。

2A地表崎岖,典型的喀斯特地形是云贵高原的特点

B. 雪山连绵,冰川广布是青藏高原的特点

C. 一望无际是内蒙古高原的特点

D. 千沟万壑,支离破碎是黄土高原的特点;

D

了解黄土高原的特点和黄土高原水土流失原因。

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【题目】 There are purple clothes, purple handbags, purple bicycles, purple furniture, even purple computers! So purple is one of the most_____ colors today. But in the past, purple was a very expensive and unusual color. Let's take a look at the rich_____ of the color purple.

Some scientists believe that the first plants to appear on Earth over 500 million years ago _____ looked purple, not green. Plants today are green because they use green chlorophyll(叶绿素)to produce energy. _____ these early plants probably used something called retinal, which is a dark purple color.

During the time of the Roman Empire(37BC—476AD), it was very difficult to make purple dye(染料). The dye came from sea snails(海螺). But 10, 000 dead sea snails_____ you just one gram() of purple dye...as well as a very bad smell! This _____ purple dye was called Tyrian purple, and it was the preferred _____ of emperors.

In 16thcentury England, purple was only _____ the king's family members. Queen Elizabeth I's clothes were purple, but ordinary people were not allowed to _____ the color.

In 1856, William Perkin, an 18yearold science student, noticed something strange while doing an experiment. The chemicals(化学药品) he used to clean his instruments______ with the chemicals he used in his experiment and produced a bright purple color. This discovery led Perkin to start a company using this chemical mixture to make purple dye. The dye was much cheaper than seasnail dye. Thanks to Perkin, now anyone can afford to wear purple clothes.

1A.peacefulB.popularC.excitingD.serious

2A.historyB.styleC.researchD.product

3A.graduallyB.especiallyC.exactlyD.probably

4A.AndB.SoC.ButD.Or

5A.gotB.passedC.wastedD.cost

6A.basicB.harmfulC.specialD.perfect

7A.colorB.smellC.plantD.animal

8A.forB.inC.asD.with

9A.wearB.sellC.changeD.make

10A.comparedB.mixedC.collectedD.kept

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