问题 选择题

原子序数为94的钚(Pu)是一种核原料,该元素一种原子的质子数和中子数之和为239,下列关于该原子的说法不正确的是

A.中子数为145

B.核电荷数为239

C.质子数为94

D.核外电子数为94

答案

答案:B

题目分析:A、在原子中质子数=核电荷数=核外电子数=原子序数,钚的原子序数为94,则其质子数为94,质子数+中子数=239,则其中子数为239-94=145,所以正确;B、在原子中质子数=核电荷数=核外电子数=原子序数,钚的原子序数为94,则其核电荷数为94,所以错误;C、在原子中质子数=核电荷数=核外电子数=原子序数,钚的原子序数为94,则其质子数为94,所以正确;D、在原子中质子数=核电荷数=核外电子数=原子序数,钚的原子序数为94,则其核外电子数为94,所以正确,故选B.

阅读理解

There is no doubt that a mother plays an important leading role in the lives of their children. But what about a ①  ① ? Fathers play just as important a role as mothers.

Fathers give us support. They are the shore(岸)we swim to when our arms and legs feel tired. ②They are the strength we rely on (依靠)as we take our first steps into the world. Fathers can be gentle and powerful, but they probably have the simplest love we ever know.

For sons, the father is their first hero and possibly the only man they will ever feel comfortable loving.

For daughters, the father is the first man they admire and the first man whose eyes shine with happiness when they look at them. He is the first man to fall in love with them.

For mothers, the father of our children is the person we can believe in to watch over the babies as closely as we would. We are protectedin the knowledge of their love. A father is the person on the planet with whom we can do whatever we want ... one who will be just as interested and never feel bored in the face of our devotion.

Without fathers, we wouldn't be mums. I would like to thank them from all our hearts for this honor and for being our partners in the business of raising children.

小题1:在①处填上适当的词,使文章完整。                    

小题2:将②译成中文。

小题3:在文中找出下列句子的同义句:If there are no fathers, we wouldn’t be mums.

小题4:根据短文回答问题:  For sons, what does the father mean?

小题5:找出文章的中心句。

判断题