问题 选择题

细胞分裂的正确顺序是

①染色体位于细胞中央②形成两个新的细胞③染色体向细胞两端移动

A.①②③

B.②③①

C.①③②

D.③②①

答案

答案:C

题目分析:细胞分裂的具体过程是:细胞分裂时细胞核先由一个分成两个,随后,细胞质分成两份,每份各含有一个细胞核,最后,在原来的细胞的中央,形成新的细胞膜和细胞壁,这样,一个细胞就分裂成为两个细胞.动物细胞是原来细胞中央的细胞膜向内凹陷缢裂成两个细胞,植物细胞是在中央形成新的细胞壁和细胞膜,由一个分成两个,可见在细胞分裂的过程中首先发生变化的是细胞核,细胞核中的染色体首先要完成复制加倍,随着分裂的进行,染色体分成完全相同的两份,分别进入两个新细胞中,故C符合题意。

阅读理解

阅读理解。

      As the Internet becomes more popular, many older media (媒体) businesses are dying out. But

TV seems to be doing OK. In fact, it's doing better than OK. Though the Internet is popular in the

world, television continues to draw more and more people all over the world to many of its programs.

Hundreds of millions turn to TV to watch World Cup soccer,Olympic Games and Discoveries.

      In many places, increasing numbers of people can watch more TV than before. Ten years ago,

only 44% of British homes had satellite or cable TV(卫星或有线电视).Today, more than 93% do.

More importantly, recent studies show that people are spending more time watching TV. Surprisingly,

this is even true of young people between the ages of 8 and 18.Today's television industry has given so

many choices. As a result, people can watch more of the things they like 24 hours a day.

     The technology behind television has also improved. The big boxes that once filled living rooms are

gone. Today's TV screens are thinner and thinner, yet the pictures are better and better. TVs are also

moving from living rooms into kitchens and vehicles.

     For years, TVs have also been used as video game players. But now they have been used in a few

new ways. Many televisions can connect to the Internet and record programs. They also let people

watch two programs at the same time. Today the most modern television has been on the way of

development.

     The Internet is the main challenge (挑战) for television now. But TV industry has shown that

television will be important for years to come.

1. 判断正(T)误(F)。

    ( ) Studies show that people are spending more time watching TV than before.

2. Many televisions can __________  the Internet and record programs.

3. Where are TVs moving from living rooms?

   ____________________________________________________________________

4. What is the main challenge for television?

   ____________________________________________________________________

5. 将文中画线句子译成汉语。

   ____________________________________________________________________

问答题 简答题