1 . Tornadoes(龙卷风) are one of the worst weather events on earth. Each year, tornadoes kill many people. The storms often carry homes, cars and trees from one place to another. And they can alsodestroyanything when they pass by.
A tornado comes from a thunderstorm(雷雨) in the sky down to the ground. It is big at the top and small at the bottom.
A tornado appears when winds in different directions meet in the cloud and begin to turn in circles. People can see tornadoes almost everywhere in the world. But most happen from late winter to middle summer. There is a second high season in November. During spring, warm air moves north and mixes with the cold air left from winter. In November, the opposite happens. Cold air moves south and mixes with the warm air left from summer.
Tornadoes always come suddenly. Weather scientists have done something to predict(预测) tornadoes. But the storms often move too fast for people to protect themselves. Last year, tornadoes killed more than one hundred people in United States.
Scientists say the best place to be in is a small room, without windows, in the middle the lowest part of a building when tornadoes come.
根据短文内容，选择最佳答案。
1. According to the passage, we know the shape of the tornadoes may be like ______.
A． | B． | C． | D． |
2. In the United States, most tornadoes happen _____.
| A．from late summer to middle summer |
| B．from late autumn to middle winter |
| C．from late autumn to middle spring |
| D．from late winter to middle summer |
| A．warm air and cold air mix |
| B．cold air and cold air mix |
| C．warm air and warm air mix |
| D．warm water and cold water mix |
| A．保护 | B．珍惜 | C．毁灭 | D．惩罚 |
| A．the United States has very few tornadoes |
| B．tornadoes are one of the worst weather events in the world |
| C．people should stay in big rooms with windows when tornadoes come |
| D．more than one thousand people were killed by tornadoes in the USA last year |
2 . Earthquake safety tips
On April 14, 2010, a big earthquake hit Yushu, Qinghai. Over 2,000 people died. Many people were hurt. Why are there earthquakes?
The surface of the Earth has many pieces. These pieces are always moving. When two pieces move past each other, there is an earthquake.
Scientist are working hard to find out more about earthquakes. They try to predict(预测) them, but it’s very hard.
Do you know how to get ready for an earthquake? Do you know what to do during an earthquake? Here are some things you should know.
What to do before an earthquake
Make sure you have two bottles of water, a packet of biscuits(饼干), a clean towel(毛巾), a few band-aids(创口贴), a radio and a flashlight(电筒) at home.
What to do during an earthquake
If you are inside:
★ Stay where you are. Quickly move under a strong desk, or along a wall. This will protect you from falling things.
★Don’t stand near windows.
★Turn off the lights.
★Don’t get into a lift during an earthquake. If your are in a lift, get out as quickly as possible.
If you are outside:
★Don’t stand near buildings. Things may fall on you.
★Lie on the ground until the shaking stops.
1. An earthquake hit Yushu _______.| A．on April 12, 2010 | B．on April 14, 2010 | C．on May 14, 2010 | D．on May 12, 2010 |
| A．some water and biscuits | B．a clean towel and a few band-aids |
| C．a radio and a flashlight | D．all of the things above |
| A．keeping you from falling things | B．turning on the lights |
| C．standing near the window | D．getting into a lift |
| A．the surface of the earth is thin |
| B．the pieces of the surface are moving slowly |
| C．two pieces of the surface move past each other |
| D．there are too many people on the earth |
| A．You can play under a big tree. |
| B．You can’t stand near the buildings. |
| C．You can lie on the ground until the shaking stops. |
| D．Both B and C. |
