五、阅读理解
Tornadoes 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 also destroy anything when they pass by.
A tornado comes from a thunderstorm 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 tornadoes. But the storms often move too fast for people to protect themselves. Last year, tornadoes killed more than one hundred people in the United States.
Scientists say the best place to be in is a small room, without windows, in the middle of the lowest part of a building when tornadoes come.
()1. In the United States, when do most tornadoes happen?
A. From late autumn to middle winter.
B. From late autumn to middle spring.
C. From late winter to middle summer.
D. From late summer to middle summer.
()2. According to Paragraph 3, when do tornadoes appear?
A. When cold air and cold air mix.
B. When warm air and cold air mix.
C. When warm air and warm air mix.
D. When warm water and cold water mix.
()3. From the passage, what can we know?
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.

1. C 2. B 3. B

【分析】
本题为英语阅读理解细节题，解题思路是针对每个题目，回到原文对应段落定位关键信息，逐一比对选项，排除不符合原文的错误选项，从而得出正确答案。
【解析】
1. 第1题：定位原文第三段“But most happen from late winter to middle summer.”，直接对应选项C，A、B、D时间与原文不符，排除。
2. 第2题：定位原文第三段，根据“warm air moves north and mixes with the cold air left from winter”及“Cold air moves south and mixes with the warm air left from summer”可知，龙卷风出现是冷暖空气混合的结果，对应选项B，A、C、D不符合原文，排除。
3. 第3题：逐一核对选项：A选项与原文“Last year, tornadoes killed more than one hundred people in the United States.”不符；B选项与第一段“Tornadoes are one of the worst weather events on earth.”一致；C选项与最后一段“the best place to be in is a small room, without windows”不符；D选项“more than one thousand”与原文“more than one hundred”不符，故正确答案为B。
【答案】
1.C 2.B 3.B
【知识点】
英语阅读理解、细节理解
【点评】
本题考查英语阅读理解的细节信息定位能力，题目设置直接，均为原文原句或简单同义转换，只要认真阅读原文，准确找到对应信息即可选出答案，难度较低。
【难度系数】
0.8