一组数据的最大值与最小值之差为80，若取组距为9，则分成的组数应是（ ） A．7

根据上下文及中文提示填写单词。

     Daming and Tony are classmates.  Tony has already made a __1__ (模型) of the space station.  This is

  for his space travel  homework, but Daming hasn't __2__ (完成) it __3_ .  Tony asks Daming not

__4__  (惊慌) __5__ (因为) their teacher Ms James wants it next week.  They have known the

 __6__ (最新的) news.  Some scientists have__7__ (发射) a spacecraft to Mars.  It has taken

 __8__ (少数,几个) months to get to Mars.  There aren' t __9__ (一些) astronauts in the spacecraft.  

 What a pity! Maybe it's an unforgettable__10__ (经验).

Write a passage of at least 60 words on the topic “A difficult choice I had to make.”（以“一个艰难的选择”为题写一篇不少于60个词的短文，标点符号不占格。）

（注意：短文中不得出现考生的姓名、校名及其他相关信息，否则不予评分。）

Using the following points as a reference.（以下问题供参考）

1. Have you ever had a difficult choice to make?

2. What made it so difficult for you?

3. What was your final decision?

4. Do you think it is a right decision?

煤的水份大小对于炼焦生产无影响。

NUBUS是（）。

A.一种网络底层控制协议

B.一种Macintosh II上总线类型

C.一种数据接口标准

D.一种网络结构体系

在使用银行自动柜员机时，随意丢弃取款凭条是安全的。