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“函数f（x）=ax+b的图象经过一、二、三象限”是“ab＞0”的                        　  [     ]

A．充分非必要条件

B．必要非充分条件　

C．充要条件

D．既非充分也非必要条件

答案

答案：A

完形填空

We are what we eat. What we are  1.          （accustom）to eating every day has a great effect on our health. Consequently (As a result), we should make         2.           effort to change our bad eating habits. As we all know , baked or fried foods may be   3.            （taste）, but eating too much of them will probably  4.             （短语）some illnesses. In addition, some food which costs us a great deal of money is not healthy,  5.            junk food.

6.           people like to eat is various from culture to culture. Compared with people in the West, Chinese people used to eat more grain, more vegetables and less meat,  7.             is a good eating habit.  8.            , things are quite different now. With the rapid economic   9.           (grow) of our country, we also eat a lot of food high in sugar and fat. If you take a casual look at people in the street, what impresses you will probably be the fact that there are a lot more fat people than ever before. We are at risk when  10.            (eat)out without          considering the balance of our food . To be healthy, we must keep it in our mind that the food we choose to eat should give us the nutrients(营养) we need.
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