问题 选择题

元素的化学性质主要取决于原子的(  )

A.最外层电子数

B.核内质子数

C.核外电子总数

D.相同原子质量

答案

当原子的最外层电子少于4个时,容易失去电子;多于4个少于8个时,容易获得电子;最外层为8个电子时,元素的化学性质最稳定.元素的化学性质主要决定于原子的最外层电子数,与质子数、、原子质量无关,所以A正确,B、C、D错误.

故选A.

阅读理解

阅读理解

      Monkeys are very similar to us in many ways. Most have ten fingers and ten toes, and brains

much like ours. In fact, Charles Darwin's theory of evolution says that monkeys and humans share

a common ancestor. We enjoy watching them because they often act like us, and we also love to

use many expressions about monkeys in almost every language This is why many monkey expressions

are about tricky people or playful acts.

      Monkeyshine is one of these expressions to show tricks or foolish acts. The meaning is clear if

you have ever watched a group of monkeys playfully chasing each other:pulling tails, stealing food,

doing tricks.

Monkeying around with something means that you do not know what you are doing. When you feel

like doing something but have no firm idea of what to do, you are monkeying around. It is just a way

to pass the time.

      Monkey business usually means secret, maybe illegal activities You may come across a news

report that there is monkey business involved in building the new airport, with some officials getting

secret payments from builders.

     Monkey suits are common names for clothes or uniforms soldiers wear. In earlier years in many

American cities, you would find men playing musical hand organs on the street. Dancing to the music

would be the man's small monkey that was dressed in a tight-fitting, colorful jacket similar to a military

uniform. So, people began to call a military uniform a monkey suit.

1. Which of the following is NOT true about the similarities between humans and monkeys?

A. Most monkeys have ten fingers and ten toes.

B. Monkeys have the same brains as humans.

C. Monkeys often act like humans in many ways.

D. Monkeys are humans closest relatives in species.

2. According to the passage, an idle wander(徘徊)on the street can he described as        

A. monkeyshine  

B. monkeying around  

C. monkey suit

D. monkey business

3. Monkey suits are commonly used to call military uniforms because they        .

A. are created particularly for soldiers' uniforms

B. are originally designed for American soldiers

C. share typical features with military uniforms

D. make American soldiers look like monkeys

4. Most monkey expressions are            .

A. used only in western cultures    

B. used on some formal occasions

C. about tricks and naughtiness

D. about terrible funny behaviors

填空题