图11中弧N为某局部经线圈，A、B两地纬度相同，O为该经线圈圆心，图中太阳光（→）与N位于同一平面，且与A相切。读图完成第18题．
此日B地的正午太阳高度为
A. 0° B. a
C. 90°-a D. 23.5°+a
答案：B
根据图示：N为某局部经线圈，A、B两地纬度相同，所以AB之间包含极点，O为该经线圈圆心，说明O为地心，图中太阳光（→）与N位于同一平面，且与A相切，说明B地位于正午，A点位于极昼区，地方时为0点，此刻太阳高度为0°，B点正午太阳高度比此刻A点大a，所以本题选择B选项。
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| More than 3,000 languages are spoken in the world. Of all these languages, English is 1 used. When it is used, the English language has also 2 many new words from other languages. For example, Americans borrowed "cookbook" from 3 .They also borrowed "tofu" and "kowtow" from Chinese. As we know, there are 4 between western culture and Chinese culture. We can learn about those by comparing how certain words are used. For example, "you are a lucky dog" 5 you are a lucky person. 6 a person who is ill, they say, "sick as a dog". On 7 hand, Chinese people love cats very much. But in western culture, ".cat" is sometimes used to describe a woman 8 is cruel. The rose is 9 a symbol of love in both China and some western countries. People think the rose 10 love, peace, courage and friendship. China, a country 11 the largest population in the world, has encouraged more people to learn English. 12 the 1990s, English learning has been very 13 with Chinese people. Many of them have done well in English and have made great progress in 14 it. Now, students are required to learn English, and the study of English is regarded as a very important industry in China 15 in the rest of the world. The English language has played an important part in our lives. | |||
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