问题 单项选择题

在()方式下,油层内的含流体饱和度一般不发生变化。

A、水压驱动

B、弹性驱动

C、重力驱动

D、气压驱动

答案

参考答案:B

阅读理解

The earliest newspapers started in ancient Rome. They were handwritten news sheets. The first printed newspapers appeared in China during the Tang dynasty, which were printed from carved(雕刻的) wooden blocks. Modern papers first appeared in Venice, Italy in the middle of the 14th century. The newspapers of today, with advertising and a mixture of political, economic, and social news and comments, were started in Britain in the mid-18th century.

The main function of newspapers is to report news. Many newspapers also provide special information to readers, such as weather reports and television timetables. They also provide comments on politics, economics, arts and culture. Almost all newspapers depend on advertising to make money.

Nearly six out of ten adults in the United States and Canada read a newspaper every day. Seven out of ten read a paper each weekend. Readers search newspapers for de-tailed background information(背景资料)and analysis(分析). This is what television and radio news reports seldom offer. Newspapers tell readers what happened, and they also help readers understand what caused an event and how it will affect the world around them.

The workers at large newspaper companies work under a lot of pressure to bring news to readers as soon as possible. Reporters, photographers, artists, and editors collect articles in just a few hours. Page designers select articles, photos, advertisements, and eye-catching headlines to make the pages, and then rush their work to the printer. Printing workers may work overnight around printing presses to churn out more than 60,000 copies per hour.

小题1:Which is the best title for the passage?

A.Production of Newspapers

B.Functions of Newspapers

C.Publication of Newspapers

D.An Introduction to Newspapers小题2:Modern newspapers were first made in ______.

A.China

B.Ancient Rome

C.Italy

D.Britain小题3:What is the main idea of the third paragraph?

A.Most adults in America and Canada read newspapers every day.

B.The importance of newspapers in people’s lives.

C.Newspapers offer readers detailed information.

D.The effects of newspapers on readers.小题4:We can infer everything from the passage EXCEPT that ______.

A.newspapers will become less popular because of the development of TV

B.few newspapers have no advertising

C.many adults in America read newspapers every day

D.people can read about many different issues in newspapers小题5:The phrase "churn out" in the last paragraph probably means ______.

A.press

B.produce

C.publish

D.sell

单项选择题

加速老化的原因有很多种,其中有一些是与个人体质有关,有一些则是因为外界因素的影响所造成的。不均衡的饮食习惯会导致过度肥胖或体重不足,而更可能造成以上两种情况交替产生。此外机体组合的各种成分之间分配不均衡,如碳水化合物、油脂、蛋白质、维生素及主体必需的微量元素等,也会造成老化现象。外界环境对呼吸道器官的神经刺激,能使弹性纤维断裂,同时还会造成人们无法想像的后果,尤其环境对呼吸道器官的神经刺激,也就是说呼吸道间的氧气会因此减少。大气污染也是呼吸道受到侵害的重要因素。虽然有些疾病必须要用药物来治疗,但使用不当,这些药物,难免会在人体内造成副作用而加速老化。太阳光的辐射线,尤其是紫外线,会渗透深层的皮肤并进行破坏。

上述因素都会协助体内各种毒素的形成,其中最主要的就是自由基。所谓自由基就是在机体循环流动的分子,或是分子的部分,经由本身能量的转换而成为有毒的分子。一个处于稳定状态的分子在受到氧电子的作用后,会变成自由基,同时也会使其他分子变质为自由基。

自由基进行攻击的目标是细胞及其外因。细胞包含了细胞核和细胞质,而细胞膜更是自由基进行破坏的第一个靶子,而当细胞膜在自行修补的功能耗尽之后,就只能任凭自由基进入细胞内部。自由基一旦进入细胞之后就会散开来破坏对细胞有正常生理作用的元素,渐渐地,不正常的细胞便形成了。最后就连细胞核也成了受攻击的目标。由于能量规律受到破坏,细胞核中传递的信息也有所更改。在自由基对细胞核进行破坏的同时,它对细胞外部的破坏作用也正同时进行,它会使支撑组织变坏,特别是会破坏弹性纤维及胶原蛋白。因此,自由基便成了加速老化的元凶。

文中划线词语“其中”指的是()。

A.体内

B.上述因素

C.各种毒素中

D.各种毒素的形成