据中央电视台2008年11月15日焦点访谈报道，某市的一个居民小区，_爱下问搜题

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问题选择题

据中央电视台2008年11月15日焦点访谈报道，某市的一个居民小区，同住一栋楼的两家人相继得上一种怪病：红细胞、白细胞、血小板严重偏低．经辐射监督管理站的专家检测，发现是周期表中77号放射性元素铱在作怪．铱元素的相对原子质量为192，下列有关铱元素的说法正确的是（　　）

A．该元素原子的核外电子数为77

B．该元素原子的质子数为115

C．该元素原子的中子数为77

D．该元素原子的核电荷数为192

答案

A、铱元素的原子序数为77，在原子中，核外电子数=原子序数，所以铱元素的核外电子数为77，故A正确；

B、铱元素的原子序数为77，在原子中，原子序数=核内质子数，所以铱元素原子的质子数是77，不是115，故B错误；

C、铱元素原子的质子数为77，相对原子质量为192，根据相对原子质量=质子数+中子数，所以铱元素原子的中子数为：192-77=115，故C错误；

D、铱元素的原子序数为77，在原子中，原子序数=核电荷数，所以铱元素的核电荷数为77，不是192，故D错误；

故选A．

问答题

简述郊区化的主要内容。

完形填空

I’ve spent most of my career as a traveling salesman, and so I know that    1   is an occupational disease. But one year, my    2   gave me the cure for my homesickness.
It had black bright eyes, a red bow tie and orange feet--- a stuffed penguin (企鹅) that   3   about five inches tall. Attached to its left wing    4   a little sign with the hand-painted declaration “ I Love My Dad!”. I immediately  5   the penguin on my table.
On my next trip, I put the   6   in my suitcase. That night when I called home, my daughter Jeanine was    7   because the penguin had disappeared. “Honey, he’s here with me,” I explained, “ I brought him    8 ”.
   9  , the penguin came with me --- as necessary as my briefcase. And we     10   along the way. In Albuquerque, I checked into a    11  , dropped my bag and ran to a meeting. When I returned, the maid had    12   the bed and stood the penguin on the pillow.
One night, I discovered the penguin    13  , and after a mad phone call, I learned I’d    14   it in my previous hotel room,    15   it had been rescued by a maid. I       16     a hundred miles to get it, and when I arrived at midnight, the penguin was waiting at the front desk. In the hotel lobby (大厅), other tired business travelers were    17     at the reunion of my penguin and me --- I think with a touch of    18  .
Jeanine is in college now, and I don’t travel    19  . The penguin sits on my table, a reminder that love is a wonderful traveling companion. All those years on    20  , it was the one thing I never left home without.

A．From now on

B．In the future

D．From then on

A．had friends

C．made friends

D．made friend

D．supermarket

B．the meeting