Text 2
The U.S. government has recently helped people learn more about the dangers of earthquakes by publishing a map. This map shows the chances of an earthquake in each part of the country. The areas of the map where earthquakes are most likely to occur are called earth quake "belts" where government is spending a great deal of money and is working hard to help discover the answer to these two questions;
1. Can we predict earthquakes
2. Can we control earthquakes
To answer the first question, scientists are looking very closely at the most active fault(断层) systems in the country, such as the San Andreas fault in California. A fault is a. break between two sections of the earth’ s surface. These breaks .between sections are the places where earthquakes occur. Scientists look at the faults for changes, which might show that an earthquake was about to occur. But it will probably be many years before we can predict earthquakes accurately. And the control’ of earthquakes is even farther away.
Nevertheless, there have been some interesting developments in the field of controlling earthquakes. The most interesting development concerns the Rocky Mountain Arsenal earthquakes. Here water was put into a layer of rocks 4,000 meters below the surface of the ground. Shortly after this injection of water, there were a small number of earthquakes. Scientists. have decided that the water which was injected into the rocks worked like oil on each other. When the water "oiled" the fault, the fault became slippery and the energy of an earthquake was released. Scientists are still experimenting at the site of these earthquakes. They have realized that there is a connection between the injection of the water and the earthquake activity. They have suggested that it might be possible to use this knowledge to prevent very big, destructive earthquakes, that is, scientists could inject some kind of fluid-like water into faults and change one big earthquake into a number of small, harmless earthquakes.

What is the most appropriate title for the passage（）

A:Dangers of Earthquakes. B:Earthquake Belts and Prediction. C:Earthquake Prediction and Control. D:Earthquake Engineering in California.

Do your children lie to you and their friends about their activities online Do they feel empty, depressed and irritable when not at the computer Do they have problems with school or work, yet they always seem to feel energized again when they are at the computers surfing the internet If you answered "yes" to one or even more of the above questions, your children are suffering from internet addiction. The amount of time kids spend online is a source of headaches for many parents. At first, parents welcomed the Internet into their homes, believing they were opening up an exciting new world of educational opportunities for their children. But soon, to their disappointment, instead of using the Internet for homework or research, their kids were spending hours instant chatting with friends, playing online games or even talking to strangers in chat rooms, which is posing real dangers to the children.
Maintaining a healthy balance between entertainment media and other activities in children’s lives has always been a challenge for parents. The Internet has made this challenge even more difficult. The engaging nature of Internet communications and interactive games means many children and teens have trouble controlling the time they spent online.
Unfortunately, parents and teachers do not realize that there is a problem until it becomes serious. To make it worse, Internet addiction is not widely recognized by the medical community. (Mental health practitioners continue to debate whether this behavior is an "addiction," with some preferring to identify it as "behavior control problems.
Children and young people can easily become "hooked" on online activities such as multi-user games, instant messaging with their pals and chat rooms. The children most easily influenced, according to the Computer-Addiction Services at Harvard Medical School, are those who are "lonely and bored or from families where nobody is at home to relate to after school."
Children who are unpopular or shy with peers are often attracted to the opportunities for creating new identities in online communities. Boys, in particular, are frequent users of online role-playing games, where they have new identities and interact with other players. Although playing these games with thousands of other users may appear to be a social activity, for the troubled child or teen, too much playing can further separate them from friends and peers.
Which one of the following is NOT mentioned as one of the activities children doing online that are giving parents headaches

A:Sending and receiving messages with their friends. B:Causing dangers to the computers with viruses. C:Chatting with people they don’t know in chat rooms. D:Playing internet games with their computers.

Text 4
The U.S. government has recently helped people learn more about the dangers of earthquakes by publishing a map. This map shows the chances of an earthquake in each part of the country. The areas of the map where government is spending a great deal of money and is working hard to help discover the answer to these two questions:
1. Can we predict earthquakes
2. Can we control earthquakes
To answer the first question, scientists are looking very closely at the most active fault systems in the country, such as the San Andreas fault in California. A fault is a break between two sections of the earth’s surface. These breaks between sections are the places where earthquakes occur.
Scientists look at the faults for changes which might show that an earthquake was about to occur. But it will probably be many years before we can predict earthquakes accurately and the control of earthquakes is even farther away.
Nevertheless, there have been some interesting developments in the field of controlling earthquakes. The most interesting development concerns the Rocky Mountain Arsenal earthquakes. Here water was pat into a layer of rocks 4,000 metres below the surface of the ground. Shortly after this injection of water, there was a small number of earthquakes. Scientists have decided that the water which was injected into the rocks worked like oil on each other. When the water" oiled" the fault, the fault became slippery and the energy of an earthquake was released.
Scientists are still experimenting at the site of these earthquakes. They have realized that there is a connection between the injection of the water and the earthquake activity. They have suggested that it might be possible to use this knowledge to prevent very big, destructive earthquakes, that is, scientists Could inject some kind of fluid like water into faults and change one big earthquake into a number of small, harmless earthquakes.

What is the most appropriate title for the passage（）

A:Dangers of Earthquakes. B:Earthquake Belts and Prediction. C:Earthquake Prediction and Control. D:Earthquake Engineering in California.

Passage Three
Early in the 16th century men were trying to reach Asia by traveling west from Europe. In order to find Asia they had to find a way past South America. The man who eventually found the way from the Atlantic Ocean to the Pacific was Ferdinand Magellan.
Magellan sailed from Seville in August 1519 with five ships and about 280 men. Fourteen months later, after spending the severe winter on the coast of Patagonia, he discovered the channel which is now called Magellan’s Straits. In November 1520, after many months of dangers from rocks and storms, the three remaining ships entered the ocean on the other side of South America.
They then continued, hoping to reach Asia. Before they arrived at these islands, later known as the Philippines, Magellan was killed in battle. The remaining officers then had to get back to Spain. They decided to sail around Africa. After many difficulties, one ship with eighteen men sailed into Seville three years after leaving. They were all that remained of Magellan’s expedition. However, their achievement was great. They were the first men to sail round the world.

Which of the following is NOT mentioned in the passage concerning the expedition（）

A:Lack of navigation equipment. B:Severe winter in Patagonia. C:The death of Magellan. D:Dangers from rocks and storms.

A number of persons have expressed concern about possible health dangers to workers who use devices called video-display terminals (终端) or VDTs. These are the devices used to show computer information. Some reports link VDTs to health disorders including eye problems and muscle problems. Even the health of the pregnant women and their unborn babies is said to be endangered. Video-display terminals produce low levels of the electromagnetic radiation(电磁辐射). Experts say most modern VDTs have been designed to limit the dangers from such radiation. However, study shows that even low levels of electromagnetic radiations can affect the growth of the cells. As a result, some doctors advise women to stop working with VDTs while they are pregnant. One study found women who work with VDTs in early pregnancy are more likely than others to have their pregnancy end unexpectedly. Researchers said that this does not necessarily mean that VDTs themselves cause problems. Some experts said the findings show working conditions, not the machines, cause the problems. Law makers in m6re than American states have proposed bills to control working conditions for VDT operators.

According to the passage we know most modern VDTs （）

A:can change the working conditions for the operators B:can limit the dangers from the electro-magnetic radiation C:can also affect the growth of the cells D:can protect the health of the computer operators

A number of persons have expressed concern about possible health dangers to workers who use devices called video-display terminals (终端) or VDTs. These are the devices used to show computer information. Some reports link VDTs to health disorders including eye problems and muscle problems. Even the health of the pregnant women and their unborn babies is said to be endangered. Video-display terminals produce low levels of the electromagnetic radiation(电磁辐射). Experts say most modern VDTs have been designed to limit the dangers from such radiation. However, study shows that even low levels of electromagnetic radiations can affect the growth of the cells. As a result, some doctors advise women to stop working with VDTs while they are pregnant. One study found women who work with VDTs in early pregnancy are more likely than others to have their pregnancy end unexpectedly. Researchers said that this does not necessarily mean that VDTs themselves cause problems. Some experts said the findings show working conditions, not the machines, cause the problems. Law makers in m6re than American states have proposed bills to control working conditions for VDT operators.

What is the best title of the passage？（）

A:Problems Existing in the American States. B:Working Conditions for VDTs Operators. C:Health Dangers to Workers Using VDTs. D:How to Protect the Pregnant Women.

A number of persons have expressed concern about possible health dangers to workers who use devices called video-display terminals (终端) or VDTs. These are the devices used to show computer information. Some reports link VDTs to health disorders including eye problems and muscle problems. Even the health of the pregnant women and their unborn babies is said to be endangered. Video-display terminals produce low levels of the electromagnetic radiation(电磁辐射). Experts say most modern VDTs have been designed to limit the dangers from such radiation. However, study shows that even low levels of electromagnetic radiations can affect the growth of the cells. As a result, some doctors advise women to stop working with VDTs while they are pregnant. One study found women who work with VDTs in early pregnancy are more likely than others to have their pregnancy end unexpectedly. Researchers said that this does not necessarily mean that VDTs themselves cause problems. Some experts said the findings show working conditions, not the machines, cause the problems. Law makers in m6re than American states have proposed bills to control working conditions for VDT operators.

What is the best title of the passage？（）

A:Problems Existing in the American States. B:Working Conditions for VDTs Operators. C:Health Dangers to Workers Using VDTs. D:How to Protect the Pregnant Women.

Passage 3

What is the most appropriate title for the passage ______.

A:Dangers of Earthquake B:Earthquake Belts and Prediction C:Earthquake Prediction and Control D:Earthquake Engineering in California