简述网络安全的五要素。

Is it a tree? Is it a bear? If you’re looking at a tree in the shape of a bear, it’s a topiary(林木雕塑). A topiary is a tree or a bush(灌木) that is trained into a shape. Growing a topiary garden takes both time and skills.

A topiary gardener should make a drawing first. The drawing shows the final shape that the gardener likes. The gardener then chooses a bush for the topiary. It may be one that just planted or one that is already in place.

In June of the plant’s first year, the gardener looks for new leaves. When the leaves grow, it’s time to shape(给……造型) the bottom of the bush. It needs about five years. The top is not trimmed during this time. In the fifth year, the bush grows tall enough for shaping. Then the gardener begins to shape the whole bush.

Once a topiary has been started, it needs care all year. In the summer it must be cut many times to keep its shape. This cutting also helps the bush grow. In the winter the bushes don’t grow. The gardeners have to brush snow of the plants, or snow may hurt some parts of them.

Topiary gardening is very old art. The Romans did it in the first Century. In the sixteenth century, people in Europe like topiaries too. By the late 1600s, topiaries were also grown in America. Today it’s popular in many parts of the world.

小题1: Put the following in the right order according to the passage.

a. The gardener chooses a bush for the topiary.

b. The whole bush grows tall enough for shaping.

c. The gardener begins to shape the bottom of the bush.

d. The gardener draws the shape of a topiary.

A．d→a→b→c

B．b→c→a→d

C．a→d→c→b

D．d→a→c→b小题2:In which part of the world did the topiary gardening begin first?

A．In Rome.

B．In Europe.

C．In America.

D．In Africa.

近年来，互联网从单一的信息传播渠道跃升为经济、社会发展的关键性基础设施，极大促进了信息消费的增长。经测算，到2015年，我国信息消费规模将超过3.2万亿元，年均增长20%以上，带动相关行业新增产出超过1.2万亿元。这表明

①生产为消费创造动力         ②生产创造出一切商品和服务  

③消费能拉动经济增长         ④消费为生产创造新的劳动力

A．①②

B．①③

C．②④

D．③④

前不久，我国科学家合成了三种新核素，其中一种是¹⁸⁵Hf。下列关于¹⁸⁵₇₂Hf的叙述中正确的是

A．该元素的原子序数是72

B．该元素的原子序数是185

C．该原子相对原子质量是185

D．该元素是一种新元素

急性有机磷农药中毒发生肺水肿，首要措施是【 】

A．彻底洗胃

B．强心苷静注

C．静注阿托品

D．吗啡静推

E．解磷胺静注

下列描述中，正确的是( )。

A) 现代计算机需要依靠人工干预才能工作
B) 现代计算机的平均无故障时间以“小时”为单位
C) 目前一般微机内存的容量在64MB和256MB之间
D) 现代计算机仅能处理数值数据