Directions: Read the following text and choose the most suitable heading from A – F for each paragraph. There is one extra heading which you do not need.

76._________________

Astronomers estimate that there are about l,100 asteroids--or space rocks--with the potential to cause a planet-wide disaster in a collision with Earth．And since large asteroids have collided with Earth many times in the past，scientists say it is certain that Earth will be hit again．It is only a question of when． 

77. _________________

The asteroid that ended the age of the dinosaurs hit the Earth 65 million years ago．It was at least six miles(10 kilometers)wide．But smaller asteroids can also devastate （毁坏）the earth．Scientists estimate that a collision with an asteroid even one—tenth this size would kill at least 25 per cent of Earth’s population．Less than a hundred years ago，for example，an asteroid only 330 feet(100 meters)wide exploded in Siberia．It completely destroyed half a million acres of forest．

78．_________________

Asteroids come from a belt of tens of thousands of space rocks in orbit around the sun．They normally travel between Mars and Jupiter，but some smaller rocks are affected by the gravitational pull of Mars，Jupiter or Saturn and their orbits are stretched．Sometimes this change puts them on a path that crosses Earth’s orbit．This sets up the possibility of collision with Earth．

79．_________________

In l986，a potentially dangerous asteroid missed Earth by only six hours．Scientists only found out about the danger after it had passed．Many more asteroids have collided with Earth over the years．We can still see their marks today — large craters in the ground．

80．_________________

NOW there is a new--found seriousness about asteroid strikes．Astronomers are engaged in a painstaking search for all asteroids that threaten Earth．And the United States has a project called NEAR that involves orbiting and studying the asteroid Eros，the second largest asteroid near Earth．Studying the composition of the asteroid provides important information hat may allow an asteroid to be exploded or knocked of course to prevent it from colliding with Earth．

第三部分：阅读理解阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项。（共20小题；每小题2.5分，满分50分）
The American book Who Moved My Cheese（奶酪） has been a bestseller all over the world. It teaches people how to face changes in their lives. Now its author Spence Johnson has written a book just for teens（青少年）. The book tells us that when facing change in our lives, like a new school or new friends, don't be afraid. Instead, use this change to make a better life. The book gives an example of a change at school. A school is changing from having two terms to three terms because there are too many students.
Several teens are talking about this. Most of them are unhappy and worried. But Chris is not. He laughs and tells a story about two mice（老鼠）, two“little people”and some cheese.
The four are in a maze looking for the cheese. Here, cheese means something important in life, like moving to a new class or getting into college. But they find the cheese is gone. The mice realize that they can’t change what has happened and have to find more cheese. This means finding different dreams. The little people, however, can’t do this. They are afraid of change so they find no cheese.
After Chris finishes the story, the friends understand one thing: to get more cheese, move in a new direction quickly. His friends understand how this can be used in the changes all teens face, such as doing well at school or having good relationships or just feeling good about yourself.
56. The book Who Moved My Cheese is __________.
A. written all over the world B. read across the world
C. sold only in America D. loved only by teens
57. What does the text mainly discuss?
A. Never change in our life.        B. Change when you like to do.
C. Change with the changes.  D. Pay attention to the changes.
58. The underline word “four”（paragraph 3） refers to __________.
A. Mice and little people       B. Students
C. Cheese              D. Readers
59. Which of the following statements is true?
A. The author is Britain.
B. There are three terms in every school.
C. Most teens don't understand Chris' story.
D. The book tells teens how to face changes in their lives.

语法填空：(共10题，每小题1.5分，共15分）

People can call 911 when they need help. The police will come quickly. This phone number should be used only  26 an emergency. But there have been some problems with people using the 911 phone number.  27 than half of the calls made to it are an accident. These accidental calls are not real emergencies.

Calling 911 when you do not need  28 can be very bad. It wastes the time of the people answering the calls. It can even force someone  29  has a real emergency to wait before  30 (get) the help they need.

Many accidental 911 calls come from cellphones. Sometimes keys on the phone  31 (push) and the call goes through without the owner of the phone knowing that he has called an emergency number. People are trying to find  32 way to solve this problem.

They are testing a new program that might help solve the problem of accidental 911 calls. This program will make  33 (call) of 911 calls push another key on the phone  34 it is a real emergency. People hope that this change  35 (reduce) the number of accidental 911 calls going through.

II. 语法填空：(10×2)

People can call 911 when they need help. The police   1  (come) quickly. This phone number should be used only   2  an emergency.  3  there have been some problems with people using the 911 phone number. More than half of the calls made to it are an accident. These accidental calls are not real emergencies.

Calling 911 when you do not need  4  can be very bad. It wastes the time of the people answering the calls. It can even force someone  5  has a real emergency to wait before getting the help they need.

Many accidental 911 calls come from cellphones. Sometimes keys on the phones  6  (push) and  the call goes through without the owner of the phone  7  (know) that he has called an emergency number. People are trying to find a way to solve this problem.

They are testing  8  new program that might help solve the problem of accidental 911 calls. This program will make  9  (call) of 911 push another key on the phone  10  it is a real emergency. People hope that this change will reduce the number of accidental 911 calls going through.

语法填空：(共10题，每小题1.5分，共15分）
People can call 911 when they need help. The police will come quickly. This phone number should be used only  26 an emergency. But there have been some problems with people using the 911 phone number.  27 than half of the calls made to it are an accident. These accidental calls are not real emergencies.
Calling 911 when you do not need  28 can be very bad. It wastes the time of the people answering the calls. It can even force someone  29  has a real emergency to wait before  30 (get) the help they need.
Many accidental 911 calls come from cellphones. Sometimes keys on the phone  31 (push) and the call goes through without the owner of the phone knowing that he has called an emergency number. People are trying to find  32 way to solve this problem.
They are testing a new program that might help solve the problem of accidental 911 calls. This program will make  33 (call) of 911 calls push another key on the phone  34 it is a real emergency. People hope that this change  35 (reduce) the number of accidental 911 calls going through.