下图为太阳辐射量随纬度分布示意图。可能总辐射量是受大气减弱之后到达地面的太阳辐射；有效总辐射量是大气和云减弱之后到达地面的太阳辐射。据此完成小题。
影响可能总辐射量分布的主要因素是（）
A.大气云量
B.大气厚度
C.昼夜长短
D.太阳高度
参考答案：D
解析：
因可能总辐射量没有受到大气中的云量的影响，所以它的变化基本上是随纬度的变化而变化，即影响可能总辐射量分布的主要因素为太阳高度。
完形填空。 Mr. Smith works in New York. Last month he had a fifteen-day holiday, but he didn’t know where to spend it. He spoke to his friend Bill,“I 1 the hot weather, but I can’t find a cool place in America. How should I spend my holiday?” “That’s easy, ” said Bill, “You’d 2 to Moscow. Snow and ice are covering the ground now. ” Mr. Smith agreed 3 his friend. He bought an air ticket and soon 4 Moscow. He had a happy trip there, but one day he 5 . After lunch he went outside the city, he saw a dog 6 him while he 7 past(走过) a house. The dog was hungry and wished him to give it some food to eat. Bad luck! He had no piece of bread or cake in his pockets. He tried to drive it away. But it began to bark at(对……大叫) him. He wanted to look for a stick but he couldn’t find anything 8 snow and ice. Suddenly he saw a stone on the ground. He hurried to 9 but failed. “How strange Russians are!” Mr. Smith said to himself, “They don’t tie dogs, but firmly (紧紧地) 10 the stones. My God!”
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