地球自转产生了（） A.昼夜现象 B.昼夜交替现象 C.区时 D.昼夜长短的变化

受精卵最初分裂形成的细胞是球形的，而组成人体的细胞性状却是多种多样的，这是因为细胞发生了（ ）

A．生长

B．分裂

C．分化

D．衰老

下列工厂中存在着投入—产出工业联系的是(    )

A．纺织厂、印染厂

B．钢铁厂、重型机械厂

C．造纸厂、化纤厂

D．食品厂、家具厂

Talking to plants makes them grow, especially if you ‘re a woman ,according to an experiment by the Ryal  Horticultural Society(RHS皇家园艺学会).

Women gardeners’ voices speed up growth of tomato plants much more than men’s, it found.

In an experiment that ran over a month, they found that tomato plants grew up  two inches taller if they were serenaded by the sweet tones of a female rather tha a male.

Appropriately the most effective talk came from Sarah Darwin ,whose great-great grandfather was legendary botanist(植物学家)Charles Darwin, one of the founding fathers of the RHS’ Scientific Committee. She read a passage from On the Orgin of Species and beat nine other”voices”.

Her plant grew nearly two inches taller than the best performing male and half an inch higher than her nearest competitor.

The experment began in Apirl,2009 at RHS Garden Wisley in Surrey. A variety of recorded voices were picked to play to 10 taomato plants over a month. Every plant was played a voice through headphones connected to the plant pot, and the conditions for all the plants remained the same throughout the experiment. To ensure the experiment was fair, two control plants were also left to grow in silence.

The results showed that women on average saw their plants rise by an inch on their male competitors. Some men were so bad that their plants actually grew less than a plant that was left completely alone.

Colin Crosbie, the leader at RHS, said:”We’re not sure why the female voice is more effecitive, It could be that they have a greater range of pitch and tone that affects the sound waves that hit the plant. Sound waves are an emvironmental effect just like rain or light.”

67.What is the best title for the passage?

A. Plants can’t grow faster without female voices

B. Women’s voices are more useful than men’s

C. Women’s voices make plants grow faster

D. Voices have positive effects on the growth of plants

68.The underlined word”serenaded” in Paragraph 3 most probably means”________”.

A.sung songs to

B.spoken to

C.talked about

D. played music to

69.According to the passage, ten_________were used in the experiment.

A.tomato plants

B.headphones

C. tape recorders

D.plant pots

70.What can we know about the findings of the experiment from the passage?

A. The women’s voices made the palnts grow faster by half an inch than the men’s.

B.Sarah Darwin’s plant grew 2 inches taller than her neraest competitor’s.

C. The plants which grew in silence did not necessarily grow the slowest

D. The women’s plants grew 2 inches taller than the men’s on average.

阅读下列材料，回答问题：（10分）

材料一　1949年10月3日，美国国务院发言人表示，美国政府继续承认国民党政府，拒绝承认中华人民共和国。美国副国务卿韦伯、国务卿艾奇逊先后在记者招待会上表示，因为中华人民共和国政府没有作出“接受国际义务”的诺言，美国政府暂时不能决定承认中华人民共和国。……(对于二战后的时局)保罗·肯尼迪在《大国的兴衰》中说：“一个国家，不在美国领导的阵营内，便在苏联的阵营内，任何中间道路的幻想都是不明智的。”美苏对抗的格局使中国没有中间道路可以选择。

——谢益显《中国当代外交史》

材料二　1969年，毛(中国)的外交政策走到了一个转折点。毛给当时的四位解放军大元帅(陈毅、聂荣臻、徐向前、叶剑英)布置了一个“家庭作业”——分析当前的国际局势和中国的战略选择。四大元帅引用了《三国演义》中(一本当时的禁书，但他们肯定毛熟读过“三分天下”)的典故，建议与当时的头号敌人美国打开关系。……在中国与美国和苏联两个超级大国的冲突中，毛和他的最高同僚们用围棋的概念化解了战略包围的威胁。

——基辛格《论中国》

请回答：

(1)据材料一，指出美国不承认新中国的借口。结合所学知识指出当时中国的外交选择，分析影响此时两国关系的主要因素。(6分)

(2)据材料二，指出中国欲与美国“打开关系”的战略意图。结合所学知识，概述20世纪70年代初中美两国“打开关系”的史实。 (4分)

平巷掘进中，顶、底眼应倾斜的角度大约为（）。

A.15°

B.5°

C.20°

D.2°