Because an empire was set up.
Because the empire fell to pieces.
Because it lost all its trees.
Because too much had been spent on wars.
第1题：
3I. Why did the writer and the woman both feel glad?
A. Because the boy had saved some money.
B. Because they both didn’t need to give anything.
C. Because the cashier didn’t look down on the boy.
D. Because all the shoppers around were willing to help the boy.
第2题：
Why does the author think it necessary to bring order to the Internet_________?
A． Because its database is disorganized.
B． Because the information required is specific.
C． Because its information is diverse and widespread.
D． All of the above.
第3题：
Why did they found Google?
A． Because they loved working with the Internet so much.
B． Because they wanted to make a lot of money through the Internet.
C． Because they hoped to make it easier to find specific information online.
D． Because they believed everything is possible.
第4题：
Why did Sturgeon's electromagnet could support nine pounds of iron?
A. Because the iron rod was bent into the shape of a “horseshoe”.
B. Because the rod was coated with varnish.
C. Because a layer of copper wire was wrapped around the rod.
D. Because the rod was made magnetic by the passing current.
第5题：
Why do people replace the term creationism with the term intelligent design nowadays?
A．Because "intelligent design" represents the modified theory of evolution.
B．Because they believe God created different species.
C．Because the term creationism is unscientific.
D．Because the term creationism is too direct.
第6题：
A.Because he comes from Red
B.Because it is his nickname
C.Because his skin is red, he is an Irish
D.Because the cigar he smokes is Red.
第7题：
Why do many of the boys avoid certain instruments?
A．Because they find it not challenging enough to play them.
B．Because they consider it important to be different from girls.
C．Because they find them too hard to play.
D．Because they think it silly to play them.
第8题：
C
In most situations, light helps us see. But nowadays humans are using too much of it so that it is in fact a kind of pollution.
When it comes to looking at the night sky, too much light makes it difficult for us to watch some of life’s most wonderful sights: stars, planets and even galaxies(星系).
According to scientific research, about 2, 500 stars can be seen by the human eye without using any special equipment(设备). But because of light pollution, you can only see 200 to 300 stars from today’s countryside, and no more than ten stars from a city. In most big cities, people cannot see the sky filled with stars like they did in their childhood.
Light pollution affects more than just our view of sky. Research shows that lots of nighttime light can harm wildlife, too.
When birds fly to another place over cities, they sometimes get lost by the brightness and fly in circles(圈) until they drop from tiredness. Sea turtles(海龟) need dark beaches for laying eggs, but they can’t find their ideal places because of those bright lights.
Too much light at night may even affect human health, but scientists are not sure of that. They are still learning more.
In order to prevent things from going worse, governments and some organizations are working to reduce light pollution. Many cities and towns have taken action to reduce the use of lights at night. Lights are used only when and where they are truly needed. They also shine lights down at the ground instead of up into the sky and use lower brightness levels.
Hopefully, in the near future, humans can enjoy the clear and beautiful sky again and all the wildlife will live a peaceful and undisturbed life, too.
27. Why does the writer think that too much light is a kind of pollution?
A. Because there are fewer and fewer stars.
B. Because human health has been affected.
C. Because too much light is a waste of energy.
D. Because some of the wildlife can be harmed.
第9题：
Why does author say that they were lucky in the third paragraph?
A. Because her situation was not serious.
B. Because many other places were flooded.
C. Because she had been to Northern India.
D. Because some others suffered even more.
第10题：
What caused the blackout in July 1977?
A. During a storm, lightning damaged cable.
B. Because of unemployment.
C. Heat waves had made people use too much electrical power.
D. Because the looters damaged the electricity supply.
34．答案为A 根据最后一段...when lightning hit and knocked out supply cables可知停电是由于闪电击中了供电电缆。