()的危害有感官恶化,不利观光、鱼类窒息或中毒死亡、影响作物生长、水质变劣、加速湖泊

题型:单项选择题

问题:

()的危害有感官恶化,不利观光、鱼类窒息或中毒死亡、影响作物生长、水质变劣、加速湖泊衰老。

A.水体富营养化

B.河流营养化

C.海水营养化

D.水体污染

考点:气候环境保护知识竞赛气候环境保护知识竞赛题库
题型:单项选择题

Peter felt (感到) very sorry because he forgot (忘记) to say “Happy Birthday” to his uncle yesterday. So he wrote(写) a letter to his uncle : “My dear uncle, I’m very sorry because I forgot your birthday. But to teach me a lesson, you’d better (最好) forget my birthday on Tuesday, tomorrow.”

小题1: It was _________________  birthday last Sunday.

A. Peter’s       

B. Peter’s father’s 

C. Peter’s uncle’s

小题2: Peter said_________________ to his uncle in the letter.

A. sorry       B. goodbye      C. hello

小题3: “Teach me a lesson” here means “_______________ ”in Chinese.

A. 向我表示祝贺 B. 教我一招 C. 教训我一下

小题4: Peter wrote this letter on_____________________.

A.Monday

B.Tuesday

C.Saturday

D.Sunday小题5:Peter wrote this letter in order to (为了) ____________________.

A. forget his birthday            

B. forget his uncle’s birthday

C. let his uncle know Peter’s birthday

题型:单项选择题

国家对境内所有飞行实行()管制。

A、按仪表的飞行

B、统一的飞行

C、按目视和仪表飞行

D、自由飞行

题型:单项选择题

对圆筒型容器下述说法正确的是()。

A.经向应力与环向应力相等

B.经向应力与环向应力均为零

C.经向应力大于环向应力

D.经向应力小于环向应力

题型:单项选择题

把人或哺乳动物的成熟红细胞作为获取细胞膜的实验材料的依据是()

A.人或哺乳动物的成熟红细胞容易获取

B.人或哺乳动物的成熟红细胞中没有任何物质

C.人或哺乳动物的成熟红细胞中没有核膜、线粒体膜等细胞器膜

D.人或哺乳动物的成熟红细胞的细胞膜在分离时容易沉淀

题型:单项选择题

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