题目内容

【题目】在爬山的过程中小明他们遇到了降雨,你认为这种雨最有可能是(  )

A.对流雨B.地形雨C.台风雨D.锋面雨

【答案】B

【解析】

根据空气上升运动的原因和形式,把降水分成三种主要类型:对流雨、地形雨、锋面雨.对流雨是空气受热膨胀上升,一般在气温较高,比较炎热的赤道地区,容易形成对流雨;地形雨是湿润气流受到山地的阻挡,被迫“爬升”,在迎风坡形成地形雨,地形雨多发生在山地迎风坡;锋面雨是冷暖空气相遇,暖空气比较轻,被冷空气“抬升”,形成降水.我国东部大部分地区的降水是锋面雨,进行分析解答。

湿润空气水平运动时,遇到山地,暖湿气流被迫沿山坡爬升,随着海拔升高,气温降低,容易成云至雨,这种降雨类型被称为地形雨。因此小明他们遇到的降雨是地形雨。故选项B符合题意。故选:B。

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【题目】 Do you love swimming? How about riding a bike? Does running make you happy? Have you ever combined (混合) the three activities into one race? If you have, then you know all about the triathlon (铁人三项).

In February 1974, a group of sports officials gathered in a bar in the Hawaiian Islands to argue: which sports in the world is the most exciting and challenging to test a person's will and strength? Some said it was football, some said it was swimming across the sea, and some said it was long-distance cycling, mountaineering marathons and so on. They expressed their opinions and argued. In the end, Brigadier General John Collins said: who can swim 3.8 kilometers in the rough (风大浪急的) sea in one day, ride a bicycle 180 kilometers around the island, and finally run the 42.195 kilometers Honolulu Marathon. Collins's idea was supported by everyone, so 15 people took part in the game the next day, including one female player. As a result, the race was completed. Such a new type of sports was born in this adventurous situation.

After the birth of the Triathlon in Hawaii, it was at first popular only in Hawaii and California, and gradually spread widely in Australia, New, Zealand, Spain, France, the United Kingdom, Japan, and China. A triathlon involves three activities. They are swimming, cycling and running. Competitors (比赛者) race in order as one continuous (连续的) event without resting.

The triathlon dates back to the 1920s in France. At that time, a race called "Les Trois Sports" challenged competitors to swim across a river, ride a bike for 12 kilometers and run for three kilometers.

The modern triathlon got its start in America in the 1970s. It first appeared in Olympic history at the 2000 Sydney Olympics. The Olympic triathlon consists of (由……组成) a 1.5- kilometer swim, a 40-kilometer bike ride and a 10-kilometer run.

If you're not ready for an Olympic triathlon, don't worry. Triathlons come in different lengths. There are mini triathlons designed for beginners. They consists of a 0.8-kilometer swim, a 24.1-kilometer bike ride and a 4.8- kilometer run. Do you want to have a try?

1Which activity is not included in a triathlon?

A. Swimming.B. Skiing.C. Cycling.D. Running.

2Where did the modern triathlon get its start in the 1970s?

A. In Canada.B. In Australia.C. In America.D. In France.

3How many kilometers does a competitor ride in a bike in an Olympic triathlon?

A. 10 kilometers.B. 12 kilometers.C. 24.1 kilometers.D. 40 kilometers.

4Which of the following statements is NOT TRUE according to the passage?

A. Triathlon competitors can have a rest when one activity ends.

B. The triathlon dates back to a race called "Les Trois Sports."

C. Triathlons come in various lengths.

D. Beginners can start with mini triathlons.

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