第2部分：阅读判断  (第16~-22题，每题1分，共7分)
    阅读下面这篇短文，短文后列出了7个句子，请根据短文的内容对每个句子作出判断。如果该句提供的是正确信息，请在答题卡上把a涂黑；如果该句提供的是错误信息，请在答题卡上把b涂黑；如果该句的信息文章中没有提及，请在答题卡上把c涂黑。
step back in time
    do you know that we live a lot longer now than the people who were born before us? one  hundred years ago the average woman 1ived to be 45．but now，she can live until at least 80．
    one of the main reasons for people living longer is that we know how to look after
ourselves better．we know which foods are good for us and what we have to eat to make sure our bodies get all the healthy things they need．we know why we sometimes get ill and what to do to get better again．and we know how important it is to do lots of exercise to keep our hearts beating healthily．
  but in order that we don’t slip back into bad habits，let’s have a look at what life was like 100 years ago．
  families had between 15 and 20 children，athough many babies didn’t live long．children suffered from lots of diseases，especially rickets(佝偻病)and scurvy(坏血病)，which are both caused by bad diets．this is because many families were very poor and not able to feed their children well．