题目内容
简单随机抽样的优点包括总体名册完整时，样本抽取方便，方法简单。
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采用消费者固定样本持续调查，回收率较低。
分群抽样适用于个体差异大的总体。
配额抽样方法是把随机抽取选定的消费者样本固定下来对其进行长期持续的调查。
Directions: Read the following passage carefully and chose the best word or phrase to fill in each blank.As Hitler’s armies drew closer and closer to Moscow, an early 1winter settled over the Soviet Union, the harshest in years. Temperatures dropped to minus 48 degrees Celsius. Heavy snows fell. The German soldiers, completely 2 for the Russian winter, froze in their light summer 3 . The German tanks lay 4 in the heavy snowbanks. The Russian winter brought the German offensive 5 .By the summer of 1942, Hitler had launched two new 6 . In the south, the Germans captured Sevastopol. Hitler then pushed east to Stalingrad, a great industrial city that stretched for 48 kilometers along the Volga River. Despite great suffering, Soviet defenders refused to 7 Stalingrad.In November 1942, the Russians8 a counterattack . With little or no shelter from the winter cold in and around Stalingrad, German troops were further weakened by a lack of food and supplies. Not until January 1943 did the Germans give up their siege. Of the three hundred thousand Germans attacking Stalingrad, only ninety thousand 9 soldiers were left. The loss of the battle for Stalingrad finally turned the tide 10 Hitler. The German victories were over, thanks in part to the Russian winter.
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