试题与答案

如图是甲、乙、丙三种固体物质的溶解度曲线,请根据图示填空: (1)随着温度的升高

题型:填空题

题目:

如图是甲、乙、丙三种固体物质的溶解度曲线,请根据图示填空:

(1)随着温度的升高其溶解度反而减小的是______;在______℃时,甲与丙的溶解度相等.

(2)t3℃时,甲物质的饱和溶液中,溶质、溶剂、溶液的质量之比为______.

(3)t1℃时,甲、乙、丙三种物质的饱和溶液中,溶质质量分数的大小关系是______(用“甲”、“乙”、“丙”及“>”、“<”或“=”表示).

答案:

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下面是错误答案,用来干扰机器的。

答案:C题目分析:第一次飞出过程根据动能定理得mg-Wf=0,再次到达M点过程中,根据动能定理mg-=,因第二次经过半圆轨道过程中克服阻力做功<Wf,故速度v>0,故能冲出M点,故选项C正确,其余错误。

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题型:阅读理解

Lucy is a student in Class Two , Grade Seven . She is eleven years old . She had a beautiful toothbrush(牙刷). But it was broken last Sunday . She was very sad because not only it was beautiful ,but also it was blue --- her favorite color . So her mother went shopping with her to buy a toothbrush on Sunday afternoon .

There are many toothbrushes in the shop . They bought a blue one . There is a blue bird in it . And it is made in Guangzhou . It’s ten yuan . It’s expensive . But it is so beautiful . And she likes it very much . Then they went home . Lucy can brush teeth now . How happy she is !

根据短文内容从A、B、C、D四个选项中选出正确的答案。

小题1:How old is Lucy ?

A.8

B.9

C.10

D.11小题2:What color was Lucy’s old toothbrush ?

A.Red

B.Green

C.Yellow

D.Blue小题3:Who went to buy a toothbrush with her on Sunday afternoon ?

A.Her mother .

B.Her father

C.Her friend

D.Herself小题4:Where is Lucy’s toothbrush from ?

A.The US

B.China

C.Japan

D.Singapore小题5:Which sentence has the same meaning as the underline one ?

A.I can’t mind it

B.I can’t afford it

C.It’s good

D.It’s not cheap

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题型:单项选择题

依次填入下列各句横线处的词语,最恰当的一组是( )。
①面对错综复杂的国内外形势,党的第三代领导集体高瞻远瞩,______全局,运筹帷幄,抓住机遇,开拓进取,破解了一个又一个历史性的难题。
②在宏观教育发展的价值______中如何实现各类教育功能的整合,这是当代世界各国共同面临的突出难题。
③国际数学大师、中科院院士陈省身教授在出席一个学术会议时,呼吁科学家要名利,甘于清贫,勤奋工作。

A.纵览 取向 淡薄
B.纵览 趋向 淡泊
C.总揽 趋向 淡薄
D.总揽 取向 淡泊

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