问题 单项选择题

关于计算机语言,下面叙述不正确的是

A.高级语言是独立于具体的机器系统的

B.汇编语言对于不同类型的计算机,基本上不具备通用性和可移植性

C.高级语言是先于低级语言诞生的

D.一般来讲,与高级语言相比,机器语言程序执行的速度较快

答案

参考答案:C

解析:解析:程序设计语言根据其面向对象(机器、过程)的不同分为低级语言、高级语言两种。面向机器的计算机语言称为低级语言,面向过程的计算机语言称为高级语言。机器语言是以二进制代码表示的指令集合,是计算机能直接识别和执行的语言。机器语言的优点是占用内存少、执行速度快,缺点是面向机器的语言,随机而异,通用性差,而且指令代码是二进制形式,不易阅读和记忆,编程工作量大,难以维护。汇编语言是符号化的机器语言,与机器语言相比,汇编语言容易写、容易懂,也容易记。缺点与机器语言相同,即通用性差,随机而异。高级语言是一种与具体计算机硬件无关,表达方式接近于人类自然语言的程序设计语言。高级语言的优点是通用性强,可以在不同的机器上运行,程序可读性强,便于维护,极大地提高了程序设计的效率和可靠性。

阅读理解

Experts say the temperature in Eyjafjallajokull's hole appears to have fallen to 100C, meaning it is now producing steam, not magma(岩浆).

But officials warned that it was too early to say whether the eruption was over completely.

Ash clouds from the volcano grounded thousands of flights last month.

Steinunn Jakobsdottir, a geophysicist from the Icelandic Meteorological Office, told the BBC that the volcano was "kind of not active for the moment".

"The history of the volcano is such that it calms down and then it gets energy again," she said.

"There are still earthquakes under the volcano, and the small earthquake is still not quite down to what it was before the eruption."

'Difficult to say'

Magnus Gudmundsson, of Iceland University, flew over the volcano on Sunday and said information from heat cameras showed the temperatures at the crater had fallen below 100C.

But he told the AFP news agency that nothing was promised and that the previous eruption at the volcano had lasted 13 months, from 1821-23.

"It stopped and started again several times with different intervals(间隔), so it's difficult to say, difficult to give a timeline," he said.

He also said it was impossible to say whether the neighbouring Katla volcano - a much larger mountain - might also erupt.

At the height of its activity, the volcano sent out huge clouds of ash, which led to airlines grounding their planes for fear it could interfere with plane engines.

It was the biggest action of closing airspace in Europe since World War II, and affected at least 10 million passengers worldwide.

小题1:What do expert think Eyjafjallajokull is like now?

A.Magma is still coming out

B.The hole appears about 100 degrees C

C.The eruption was not over

D.It is very cold.小题2:How do expects know the temperature in Eyjafjallajokull's hole?

A.By taking photos

B.By taking its temperature

C.By going close to it

D.By driving past it小题3:What does Steinunn Jakobsdottir think of Eyjafjallajokull?

A.It will erupt again soon

B.It will be sleeping

C.Another mountain might also erupt

D.It’s uncertain小题4:What do you think the main idea is?

A.the biggest action of closing airspace in Europe

B.the temperature in Eyjafjallajokull's hole

C.The Eyjafjallajokull volcano in Iceland

D.The earthquake in Iceland

单项选择题