toefl selection test

Floods can cause tremendous damage.  They can ruin houses, roads and buildings. Floods can take down trees and cause mudslides. It often leaves mud, sand and debris behind.  It can take months to clean up after a flood.
 What is the main idea?

• Floods can cause a lot of damage.
• Floods cause mudslides.
• Floods damage houses and roads. 

Soccer is known in some countries as football. It is a popular sport across the world, with over 200 countries playing the sport. It is estimated that over 250 million people, both men and women, play soccer. The sport has been part of the Olympic games from 1900 to 1928 and from 1936 to today.
 What is the main idea?

• Soccer is important at the Olympics.
• Soccer is a worldwide sport.
• Soccer is also called football.
• Soccer is played by men and women.

Forces other than damaging winds are also at work inside tornadoes. Sometimes, as the writhing, twisting funnel passes over a house, the walls and ceiling burst apart as if a bomb had gone off inside. This explosion is caused by the low air pressure at the center of a tornado.

The pressure at the center of a tornado is usually 13 pounds per square inch. However, inside the house the air pressure is normal, about 15 pounds per square inch. The difference of 2 pounds per square inch between the inside and outside pressure may not seem like much. But suppose a tornado funnel passes over a small building that measures 20 by 10 by 10 feet. On each square inch of the building, there is 2 pounds of pressure from the inside that is not balanced by air pressure outside the building. On the ceiling, that adds up to an unbalanced pressure of 57, 600 pounds. The pressure on the four walls adds up to 172,800 pounds.

If windows are open in the building, some of the inside air will rush out through them. This will balance the pressure inside and outside the building. But if the windows are shut tightly, the enormous inside pressure may cause the building to burst.

Unfortunately, heavy rain and hail often occur in thunderstorms that later produce tornadoes. So people frequently shut all windows to protect their property. This may cause far worse damage later. For the same reason, tornado cellars must have an air vent. Otherwise, the cellar door might be blown out when a tornado passes over it.

Which of the following is the main topic of the passage?

• How tornadoes can be prevented

• When tornadoes usually occur

• Where tornadoes are formed

• Why tornadoes cause so much damage

Forces other than damaging winds are also at work inside tornadoes. Sometimes, as the writhing, twisting funnel passes over a house, the walls and ceiling burst apart as if a bomb had gone off inside. This explosion is caused by the low air pressure at the center of a tornado.

In line 2, the word "funnel" refers to which of the following?

• A bomb

• A house

• A tornado

• An explosion

Forces other than damaging winds are also at work inside tornadoes. Sometimes, as the writhing, twisting funnel passes over a house, the walls and ceiling burst apart as if a bomb had gone off inside. This explosion is caused by the low air pressure at the center of a tornado.

The pressure at the center of a tornado is usually 13 pounds per square inch. However, inside the house the air pressure is normal, about 15 pounds per square inch. The difference of 2 pounds per square inch between the inside and outside pressure may not seem like much. But suppose a tornado funnel passes over a small building that measures 20 by 10 by 10 feet. On each square inch of the building, there is 2 pounds of pressure from the inside that is not balanced by air pressure outside the building. On the ceiling, that adds up to an unbalanced pressure of 57, 600 pounds. The pressure on the four walls adds up to 172,800 pounds.

If windows are open in the building, some of the inside air will rush out through them. This will balance the pressure inside and outside the building. But if the windows are shut tightly, the enormous inside pressure may cause the building to burst.

Unfortunately, heavy rain and hail often occur in thunderstorms that later produce tornadoes. So people frequently shut all windows to protect their property. This may cause far worse damage later. For the same reason, tornado cellars must have an air vent. Otherwise, the cellar door might be blown out when a tornado passes over it.

According to the passage, tornadoes can destroy buildings because the

• force of a tornado increases the air pressure in a building

• air pressure at the center of a tornado is over 172,000 pounds

• weight of a tornado can crush a building's roof when it passes overhead

• air pressure inside a tornado is less than the air pressure inside a building

The swimming pool ---- at 9 o'clock and ---- at 18.30 every day

• is opening / is closing

• opens / closes

• has opened / has closed

• opened / closed

The Olympic Games ---- place every four years.

• have taken

• are taking

• take

• took

Look! That man ---- to open the door of your car.

• tries

• has been trying

• tried

• is trying

2. Archaeologists ---- recently that an ancient underground city around Cappadocia has long wide corridors where there are many special areas for making cheese and wine.

• have explained

• explained

• explain

• had explained

. You ---- very ill. I don’t think you ---- after your health properly.

• are looking / looked

• have looked / have looked

• looked / have been looking

• look / are looking