下列说法正确的是 ( )_刷题宝

题干

下列说法正确的是 ( )

A：大气是由干洁空气、水气和固体杂质组成

B：水气和固体尘埃是成云致雨的充分条件

C：CO2是植物进行光合作用的重要原料，但对地面不具有保温作用

D：臭氧含量很少，但它能大量吸收太阳紫外线

上一题下一题 0.0难度选择题更新时间:2019-03-24 09:44:53

答案(点此获取答案解析）

D

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已知四边形ABCD是平行四边形，下列结论中不正确的有（　　）.

①当AB＝BC时，它是菱形；②当AC⊥BD时，它是菱形；③当∠ABC＝90°时，它是矩形；④当AC＝BD时，它是正方形．

同类题2

What are the most successful movies?
American movies are the most popular around the world. The most successful movies of the twentieth century wad Titanic. People around the world paid almost $2 billion, and they saw the famous ship sink again. Titanic was more popular than Star wars. This Star Wars film made almost $1billion in the late 1990s. Close behind this was Jurassic Park, a film about dinosaurs. And it’s interesting that Titanic was also the most expensive film: it cost $200 million to make.

Which is the world’s most popular sport?
The world most popular sport is or soccer．It’s more popular than football，basketball，or baseball．FIFA has 4.1 million teams，and 200 million players in l90 countries around the world．More than one billion people watch the World Cup Final on TV every four years. In the United States，soccer is not the most popular for spectators(观众)，but it is the most popular sport for kids and teens．About 3 million Americans under the age of nineteen play soccer．

What are the largest shopping malls?
The largest shopping mall in the world is the West Edmonton Mall in Edmonton，Canada．The mall has more than 800 retail stores，including eight department stores．There is also a 335‘room hotel·It’8 much；larger than the 8econd largest mall in the world：this is the mall of America in Bloomington，Minnesota．The US mall has 400 stores. Its amusement attractions include a roller coaster. Some people spend their vacation at this mall．But in the future，the biggest stores probably are going to be on the computer：some online malls already say that they have stores in l00 countries·

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下列划线词语的解释正确的一项是（）

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20世纪初，有一首歌曲迅速成为时代新声．歌词唱道：“亚东开发中华早，揖美追欧，旧邦新造，飘扬五色旗……”词中的“旧邦新造”是指（　　）

同类题5

如图是《战国七雄形势图》，其中①②③④所示位置（　　）

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