单项选择题
Which of the following led to the growth of ice trade according to the passage().
A.The growth of the American population. B.The expansion of cities. C.The change of the diet of ordinary citizens. D.The increasing need for food.
单项选择题 How does Walter get along with his new business().
单项选择题 What does the speaker suggest doing().
判断题 There has been ample evidence to show that there is some category of "natural leader".
