19、Imagine this：a television screen has the size and thickness of a piece of paper．You carry it around in your pocket and take it out when you want to watch a show．Imagine a guitar so tiny that you can’t see it with the human eye，but you can hear sound when its strings are pulled．

Nanotechnology(纳米技术) is the science that deals with doing things in a very small way, and it is being studied and developed all over the world ．Many scientists say nanotechnology will produce the next industrial revolution(工业革命) ．

Perhaps nanotechnology will have the biggest influence on medical science．Imagine nanobots(纳米机器人)in medicine．Thousands or even millions of tiny machines can be sent into the human body with specific tasks．For example, they can be designed to find and destroy cancer cells or viruses(病毒) ．Other machines may stay in the human body for ever to help organs(器官) that are not working properly．

When could all of these happen? Scientists predict that most of these are possible in the next 30 years．Thousands of scientists around the world are working on these micro-machines ．Nanotechnology is just around the corner．

1．The two examples in Paragraph 1 are used to _______．

    A．introduce the smallest television

    B．introduce a new kind of guitar

    C．introduce the topic of the passage

    D．show how small the world is

2．Nanotechnology_________．

    A．will cause an industrial revolution

    B．deals with things in old ways

    C．has studied the whole world

    D．was developed many years ago

3．The underlined world“they”in the third paragraph refers to(指代)“________”．

    A．scientists      B．human bodies         C．specific tasks       D．tiny machines

4．The tiny machines __________．

    A．are too small to be repaired

    B．call be put in a human body to kill viruses

    C．may not work well in a human body

    D．can take the place of human organs

5．The underlined phrase“around the corner”in the last sentence mans“________”．

    A．far away       B．at present      C．in the near future          D．impossible

17、根据对话内容，从方框中选择适当的选项补全对话。选项中有两项为多余的选项

Kevin：Hi，how was your school trip?

Tina：  1 

Kevin：Did you go to the zoo?

Tina： 2  I went to the aquarium．

Kevin：Oh，it must be very interesting．  3  

Tina：No，there weren’t any sharks, but there were some really clever seals．

Kevin：Wow，that sounds wonderful !  4   

Tina：Well，I hung out with my friends and I took lots of photos．

Kevin：  5  

Tina：Of course．I’ll bring them to school as soon as they come out．

Kevin：Thank you．

16、Look! There is ______picture on the wall．How nice it is!

A．a                  B．an                C．the                 D．／(不填)

15、We have no_______ in the fridge．Let’s go and buy some peas，carrots and cabbages．

A．vegetables           B．eggs               C．meat               D．fruit

14、We do hope the people in Sichuan will soon _________their troubles．

A．go over         B．turn over        C．get over                D．look over

13、一Why was Mrs. Smith angry with Jack?

—Because he worked _________than the others．

A．more carefully           B．worse             C．better              D．more clearly

12、When my father got home，I _________a letter to my friend．

A．write     B．am writing       C．wrote               D．was writing

11、一May I play computer games，Mum?

一No．You ___________finish your homework first．

A．will         B．can           C．would             D．must

10、Usually people in Japan and Korea ________when they meet for the first time．

A．are supposed to kiss            B．are supposed to bow

C．suppose to kiss                      D．suppose to bow