红王后假说认为以百万年计的时间尺度里,物种的灭绝率保持相对稳定,即使在保持不变的物理

题型:单项选择题

问题:

红王后假说认为以百万年计的时间尺度里,物种的灭绝率保持相对稳定,即使在保持不变的物理环境中,进化也会无限的进行,因为每个物种都在不断进化以适应其他种的变化。根据这个内容,下列表述中哪个是不正确的?()

A.进化的动力是生态系统中种间的相互作用

B.该假说的基础是协同进化

C.根据该假说,有性繁殖可以有效减少有害寄生物侵染的风险

D.在该假说描述的过程中,环境变化是重要的影响因素

考点:生物学生物学综合练习生物学综合练习题库
题型:单项选择题

皮内注射可用于()

A、药物过敏试验

B、预防接种

C、局部麻醉的起始步骤

D、胰岛素治疗

E、脱敏治疗

题型:单项选择题

青春期男女素质指标差别迅速扩大是在()。

A.7~15岁

B.13~18岁

C.13~16岁

D.15~20岁

E.7~12岁

题型:单项选择题

抽屉试验阳性,提示膝关节是()

A.关节腔积液

B.侧副韧带损伤

C.半月板损伤

D.交叉韧带损伤

E.以上都不是

题型:单项选择题

今有氯酸钾和二氧化锰的混合物100克加热制取氧气.在反应前已测得二氧化锰在混合物中占25%,而经反应一段时间后测得二氧化锰占35%,问:

(1)在该过程中制得氧气多少克?

(2)还有多少克氯酸钾没有分解?(保留一位小数)

题型:单项选择题

第三部分:阅读(共20小题;每小题1.5分,满分30分)

阅读下列短文,从每题所给的A、B、C和D项中,选出最佳选项,并在答题卡上将该项涂黑。

Most people want to know how things are made. They honestly admit, however, that they hardly know a thing when it comes to understanding how a piece of music is made. Where a composer begins, how he manages to keep going – in fact, how and when he learns his trade – all are covered in complete darkness. The composer, in short, is a man of mystery.

One of the first things the common man wants to know about is the part inspiration(灵感)plays in a composer’s work. He finds it difficult to believe that composers are not much interested in that question. Writing music is as natural for the composer as eating or sleeping for all. Music is something that the composer happens to have been born for.

The composer, therefore, does not say to himself: “Do I feel inspired?” He says to himself: “Do I feel like working today?” And if he feels like working, he does. It is more or less like saying to himself: “Do I feel sleepy?” if you feel sleepy, you go to sleep. If you don’t feel sleepy, you stay up. If the composer doesn’t feel like working, he doesn’t work. It’s as simple as that.

66. What would be the best title for the text?

A. Composer: a man of mystery           B. Practice makes good music

C. Relation between sleeping and music       D. Music: product of nature

67. The words “covered in complete darkness” underlined in paragraph 1 most probably mean__________

A. difficult to be made   B. without any light       C. black in color    D. not known

68. Most people seem to think that a composer________.

A. finds it difficult to write music     B. considers it important to have a good rest

C. should like to talk about inspiration  D. never asks himself very simple questions

69. The author will most probably agree that composers_________.

A. are born with a gift for music      B. are people full of mystery

C. work late at night for their music     D. know a lot about eating and sleeping

70. What does the passage mainly talk about?

A. How the music produces.

B. How secret the composer’s work.

C. Why the composer is so popular with people.

D. What the composer often thinks about.

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