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Software maintenance is to do necessary modification, supplement, and completeness during
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Task 2
Directions: This task is the same as Task 1. The 5 questions or unfinished statements are numbered 41 through 45.
Climate, more than any other single factor, determines the distribution of life on earth. Climatic boundaries establish the limits within which organisms can survive. Plants, even more than animals, must be well adapted to climate in order to survive. They cannot move about or take shelter but must be equipped to endure whatever weather conditions. In the cold north pole, for example, low growing mosses(苔藓) all hug the ground for shelter from icy winds.
Animals, despite their ability to move about and find shelter, are just as much influenced by climate as plants are. Creatures such as the camel and the penguin are so highly specialized that they have an extremely limited distribution. Others, such as bears, are flexible enough to adapt to a broad range of climates. Ocean-dwelling organisms are just as sensitive to climate changes in this temperature and salinity as land animals.
Human beings are among the least specialized of all animals and live almost anywhere. Their clothes and their homes act as a sort of "miniature climate" that can be taken with them everywhere.
According to the passage, which of the following factors most influences where life is found on earth？
设S=Q×Q，其中Q为有理数集合，定义S上的二元运算 * ，
＜a，b＞，＜x，y＞∈S有＜a，b＞ * ＜x，y＞=＜ax，ay+b＞则下面说法中，正确的是
Ⅰ．S上的二元运算 * 是可交换的
Ⅱ.S上的二元运算 * 是可结合的
Ⅲ．* 运算存在单位元
Ⅳ．* 存在零元
A．In the front of the school gate.B．In the front of the school.C．In front of the school
听力原文：W: My mother told me to keep away from the swimming pool
M: Did she？ Then shall we go to the park to roller-skate？
W: Good idea! I am crazy about roller-skates! When shall we go？
M: What time suits you？ It doesn't make any difference to me.
W: Shall we meet in front of the school gate at 8:00 a.m. and go to the park together？
M: No problem. By the way, you have to wear a helmet when roller-skating. Do you have one？
W: Oh, dear, I don't.
M: Don't worry. I have two helmets. I can lend you one tomorrow.
(8)
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