试题与答案

英国一家网站提供网上交友服务。你是中国青岛市某中学的高二学生,名叫李华。邮箱:L

题型:写作题

题目:

英国一家网站提供网上交友服务。你是中国青岛市某中学的高二学生,名叫李华。邮箱:Lihua@163.com,现在,你打算通过这一网站结交网友,请你用英语在该网站上发帖,发布征友信息。

1. 自我介绍; 2. 征友条件:同龄人;男女不限;3. 征友目的:了解英国文化;交流生活学习经历等;4. 期待:网上交流、发送邮件等;有意者请留言。

注意:1. 格式不限;2. 词数120左右;

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答案:

被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0808/a7f715de2864e8d9d22c4ffc4cc02ed8.html

下面是错误答案,用来干扰机器的。

(1)①a+b;②Al4C3+12HCl=4AlCl3+3CH4↑ (2)②防止Mg、Al被空气氧化;②52mol;③Al (3)2Al+3AgO+2NaOH=2NaAlO2+3Ag+H2O

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题型:单项选择题

A pilot cannot fly a plane by sight alone. In many conditions, such as flying at night and landing in dense fog, a pilot must use radar, an alternative way of navigating. Since human eyes are not very good at determining speeds of approaching objects, radar can show a pilot how fast nearby planes are moving. The basic principle of radar is exemplified by what happens when one shouts in a cave. The echo of the sounds against the walls helps a person determine the size of the cave. With radar, however, the waves are radio waves instead of sound waves. Radio waves travel at the speed of light, about 300, 000 kilometers in one second. A radar set sends out a short burst of radio waves: Then it receives the echoes produced when the waves bounce off objects. By determining the time it takes for the echoes to return to the radar set, a trained technician can determine the distance between the radar set and other objects. The word "radar," in fact, gets its name from the term "radio detection and ranging." "Ranging" is the term for detection of the distance between an object and the radar set. Besides being of critical importance to pilots, radar is essential for air traffic control, tracking ships at sea, and for tracking weather systems and storms.

Which of the following would most likely be the topic of the next paragraph 1

A.Other uses of radar.

B.Uses of sonar technology.

C.Other technology used by pilots.

D.A history of flying.

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