嗷嗷待哺的婴儿主要是与妈妈交流，蹒跚学步的孩子主要在父母的引导下逐步跑跳自如，咿呀学语的幼儿开始与熟悉的小朋友一起嬉戏……上述现象（　）

①说明了人随着年龄的增长，交往的范围会逐步扩展   ②启示我们积极交往，不断扩大交往范围，提高交往能力

③说明了扩大交往范围，越快越好                                   ④说明了人们都会交往

    About 70，000，000 Americans are trying to lose weight．This is almost one out of every three people in the United States．Some people eat 1food and they hardly have any fats or sweets. Others do running exercise with machines，take medicines，or even have operations2you can see losing weight is 3 work，and it will also cost a lot of money．But 4do so many people in the United States want to lose weight?
    Many people in the United States worry about their look of the body．For many people，looking nice also means to be 5．Other people worry about their health as many doctors 6 overweight is not good．
    Most people want to find a faster and 7 way to take off fat，and books of this kind are very popular．These books tell people how to lose weight．Each year a lot of new books like these are 8．Each one says it can easily help people take fat away．
    Losing weight can be expensive．Some overweight people go to health centers，like La Costa in California．Men and women9several hundred dollars a day at these health centers．People live there for one week or two，taking exercise，eating different foods．Meals there may be just a little．All this works for losing weight．104 days on the program，one woman called Mrs. Warren lost 5 pounds(2.27kg)．At 400 dollars a day, she spent 320dollars to lose each pound．But she said she was still glad to do so．
    Health centers，books，medicines，operations，running and exercise machines all get a lot of money．So in the United States，losing weight may mean losing money too.

对右图表述正确的是（    ）

如图，一个点从数轴上的原点开始，先向右移动3个单位长度，再向左移动5个单位长度，可以看到终点表示的数是﹣2．

已知点A是数轴上的点，完成下列各题：