有“空中死神”之称的环境问题是_刷题宝

题干

有“空中死神”之称的环境问题是（　　）

A：臭氧空洞

B：光化学烟雾

C：酸雨

D：沙尘暴

上一题下一题 0.0难度选择题更新时间:2017-07-06 02:43:10

答案(点此获取答案解析）

C

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图甲骨文所示的四个字分别为春、夏、秋、冬。其中“春”字像植物生长的形状，寓意春种；“夏”字像草木繁茂之状，寓意夏长；“秋”字像果实累累，谷物成熟，寓意秋收；“冬”字则形如把谷物藏于仓廪之中，寓意冬藏。由此我们可以推测（）

同类题2

It's Spring Festival today.We have a big family .

同类题3

填空

①What is your father? ____ a. No, it's very boring.

②Do you like playing basketball?____ b. We can play basketball.

③What did you do yesterday afternoon?____ c. It's rainy.

④What's the weather like today?____ d. My father is a doctor.

⑤What can you do after school?____ e. I shopped at a shopping mall.

同类题4

已知m∈R，向量

\vec{a}

=（m，1），

\vec{b}

=（2，﹣6），且

\vec{a}

\vec{b}

\vec{a}

\vec{b}

同类题5

The president promised to keep all the board members _________ of how the negotiations were going on.

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