问题 单项选择题

2010年5月第31题以下关于MIDI的叙述中,错误的是()。

A.MIDI标准支持同一种乐器音色能同时发出不同音阶的声音

B.MIDI消息的传输使用单向异步的数据流

C.MIDI可以看成是基于音乐谱描述信息的一种表达方式

D.MIDI电缆上传输的是乐器音频采样信号

答案

参考答案:D

解析:MIDI标准作为一种音乐信息序列交换的标准格式,存储和表达的是音乐的演奏信息,可以把一般的基于乐谱描述信息的数字音乐格式转换成为MIDI标准格式来进行处理。 MIDI标准详细描述了相关的硬件标准、数据传输速度、传输的信息格式等,MIDI不是声音信号,在MIDI电缆上传送的不是声音的采样信号,而是发给MIDI设备或其他装置让它产生声音或执行某个动作的被称为“MIDI消息”的指令。

阅读理解

   Many scientists are now exploring the idea of going to live on Mars. Some other scientists from the MASA AMES Center(美国宇航局) have already started the creation of a “Mars town” and many others are in fact already experimenting with it. Of course, these experiments are done on Earth itself but this “Mars town” has an environment practically like that of Mars.

The astronauts working in these towns wear their space suit and also do everything they would really have to carry out if they ever go to Mars in the future.

But Mars would be like Earth, a temporary(临时的) place for humans. When the Sun starts swallowing up(吞掉) the planets, Mars will disappear only hours after Earth. So Mars only seems to be the ideal place to spread the human beings. It is also a good location to send humans if ever there is a disaster on Earth. By saying disaster, I mean asteroids(小行星) hitting and things like that.

If we humans do not want to disappear when Earth or Mars gets swallowed up, we will have to go and live beyond the solar system. But are there any planets outside our solar system prepared to support life? Astronomers’ answer is:

“If Earth can support life, why can’t other planets do the same too? Astronomers have already discovered a Jupiter(木星)- like planet orbiting a Sun-like star, so why not an Earth-like planet orbiting a Sun-like star?

To achieve this goal though, many other problems have to be taken into consideration. How do we transform(改造) a dusty planet like Mars into one more or less like our Earth? How should we go on? There is still a long way to go.

小题1: The “Mars town” mentioned in the passage is ___________

A.a research base on Mars.

B.an experimental lab built on Earth.

C.a strange place on Mars .

D.a town existing in scientists’ imagination小题2: We can know from the passage that astronomers probably think ____________

A.it is impossible to transport humans to other planets.

B.there may be an Earth-like planet outside the solar system

C.humans will move to the new-found Jupiter-like planet

D.there’s no need for humans to move beyond the solar system.小题3:Why would Mars only be a temporary(临时) place for humans?

A.The conditions there would be too hard for the human beings

B.There would be more disasters like asteroids hitting.

C.It would disappear when Earth disappeared.

D.It would be too hot to live on.小题4:The underlined word “orbiting” in the fifth paragraph is closest in meaning to “________”

A.moving around

B.getting close to

C.passing by quickly

D.going through小题5:Which of the following would be the best title for this passage?

A.Mars Town

B.Living on Mars

C.The Future of Earth

D.Where to live in the Future

单项选择题