在计算机内部使用二进制数,为计算机进行( )提供了有利条件。A.加法运算 B.减法

题型:单项选择题

问题:

在计算机内部使用二进制数,为计算机进行( )提供了有利条件。

A.加法运算

B.减法运算

C.逻辑运算

D.逻辑判断

考点:计算机等级考试MSOffice一级MSOffice笔试61
题型:单项选择题

Tony is six years old. He is a good boy. But he can’t get up early. He sleeps until nine or ten o’clock in the morning. He is often late for school.

Tony’s mother doesn’t want him to be late for school. So she buys him an alarm clock. She tells Tony, ‘ you must get up when you hear the clock ring.’

‘Yes, Mum,’ said Tony. After that Tony get up at seven thirty when he hears the clock ring.

One day his mother forgets (忘记)to make the clock ring. And the next morning Tony doesn’t get up at seven thirty. It’s time for breakfast. Mother goes to see him. Tony is in bed and his eyes are open.

‘Why don’t you get up?’ His mother is angry.

‘I am waiting for the bell.’

1. Tony’s mother buys him a clock, because ________.

A. he can’t get up early in the morning           B. the clock is good

C. Tony likes it                             D. she wants to give her son a present

2. This article(文章) is ________.

A. a piece of news     B. a joke        C. a letter  D. an introduction(介绍)

题型:单项选择题

合作是  _ __ 的基础,共享是______ 的必然结果。

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达尔文在他的《物种起源》中提出的自然选择学说的中心内容是  [ ]

A.生物同时具有遗传和变异  

B.生物界具有适者生存,不适者被淘汰

C.用进废退  

D.过多使用抗生素,细菌就会适应而不受其影响

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薄荷与蔓荆子的共同功效是____,____。

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从业人员的持证要求有哪些?

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