计算：cos45°=______．

外科手术器械和罐头食品的灭菌，都要以能够杀死细菌的______作为标准，否则极易引起病人感染和罐头食品腐败．

《中华人民共和国对外贸易法》是我国对外贸易法律体系中的母法，它对我国对外贸易关系的法律调整作了原则性的规定。下列有关该法的表述错误的是：( )。

A．《对外贸易法》不适用于边境贸易和单独关锐区香港和澳门

B．我国的对外贸易经营主体只能是经国务院对外经济贸易主管部门许可可以从事对外贸易经营权活动的法人和其他组织

C．没有对外贸易经营权的单位和个人，可以委托有外贸经营权的经营者在其经营范围内代理进口或出口

D．对于限制进口或出口的货物，实行配额或许可证管理，对于限制进口或出口的技术，实行许可证管理

D

Anyone for rocket salad? The Chinese are now growing huge vegetables from seeds they sent into space.

If you are the type who worries about the air miles travelled by fruits and vegetables, these beauties aren’t for you. It's because they have travelled a little further than most.

The seeds from which they grew were fired into space, where they orbited the earth for two weeks. Once they returned they were grown in hothouses, producing the monster kinds seen here.

China, which is behind these space fruits and vegetables, says they could be the answer to the world's food crisis.

The 21-pound tomatoes, nine-inch chillies, 15-stone pumpkins and large watermelons growing at the Guangdong Academy of Agricultural Sciences’ hothouses can feed many more than their smaller cousins, and may have more nutrients, the scientists say.

Researcher Lo Zhigang said, "Traditional agricultural development has taken us as far as we can go and demand for food from a growing population is endless. Space seeds offer the opportunity to grow fruits and vegetables bigger and faster. "

He admitted he and his colleagues could not explain why time in orbit caused the seeds to change genetic structure. But they guessed exposure to the cosmic（宇宙的）radiation that attacked the spacecraft in orbit, as well as the near zero gravity conditions, microgravity, could play a part.

"We don't think there's any threat to human health because the genes themselves do not change; just their order changes," he said. "With genetically-modified（GM）crops you have seen environmental problems because they have added genes that can damage other organisms. But with space seeds they don't gain genes; they can only lose them. "

He also claimed the Vitamin C content in some space vegetables was nearly three times higher than in common vegetables, while levels of zinc are also increased.

Western scientists are doubtful. NASA researchers who have experimented with seeds in space say there is not enough benefit to show the cost is reasonable.

63. What do the underlined words "these beauties" in Paragraph 2 probably refer to ______?

A. Beautiful views along the air routes.          B. Travelling experiences in space.

C. Seeds fired into space.                     D. Giant vegetables.

64. We can infer from Lo’s words in Paragraph 6 that _______.

A. our conventional agriculture has developed too slowly.

B. we are asking too much from nature

C. space seeds may help meet our demand for food

D. we'll grow crops in space in the future

65. Why the seeds changed their genetic structure _______.

A. remains to be proved

B. is discovered by Lo Zhigang

C. has something to do with the conditions in hothouses

D. is due to the radiation that attacked them directly

66. What can be inferred from the last paragraph?

A. Western scientists’ doubt is unreasonable.

B. Western scientists don’t believe that Chinese scientists have succeeded in the experiment.

C. Western scientists have proved space seeds to be of no benefit.

D. Western scientists think the cost of space seeds outweighs the benefits

江苏省泰州市信访局局长张云泉有一个“三鞠躬”的故事：当地发生一起交通事故，遇难者的亲友因担心处理不公，聚集上千名村民要围堵高速公路。张云泉闻讯赶到了现场。众目睽睽之下，他向死者遗像及其亲属深深地鞠了三个躬说，第一个躬是我代表信访局全体同志向遇难者致哀，向家属和亲友们表示慰问；第二个躬是代表肇事者及其家人向遇难者和各位道歉；第三个躬是代表政府向你们承诺，请你们相信有关部门一定会依法处理好这件事。三鞠躬和三句话，稳定了村民们的情绪，危机得到化解。这三鞠躬体现的是，中 * * 党（   ）

A．代表中国先进文化的前进方向

B．代表中国最广大人民的根本利益

C．代表中国先进生产力

D．最高理想是实现 * * 主义