题目内容

【题目】下列节日中,湖北省恩施市的昼长比夜长短的是(

A. “五一”劳动节B. “六一”儿童节C. “八一”建军节D. 元旦

【答案】D

【解析】

本题考查了地球公转产生的现象。

恩施位于湖北省西南部,地处北半球。地球绕太阳公转的过程,太阳直射点在南北回归线之间有规律的移动。太阳直射点在春分(321日前后)和秋分(923日前后)时直射赤道,此时昼夜平分;当太阳直射点在北回归线时,北半球是夏至日(622日前后),这一天昼最长夜最短;当太阳直射点在南回归线时,北半球是冬至日(1222日),这一天昼最短夜最长.因此可知,秋分到冬至、冬至到春分这段时间内,北半球的昼长比夜长短;春分到夏至、夏至到秋分这段时间内,北半球的昼长比夜长长。分析选项中的节日可知,五一劳动节、六一儿童节位于春分到夏至之间,八一建军节位于夏至到秋分之间,元旦(11日)位于冬至到春分之间,因此恩施的昼长比夜长短的是元旦;故选:D

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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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