【答案】　D

　　2．Why do people avoid an orphan whose parents have died of AIDS?

　　A．Because people don't know how HIV is spread.

　　B．Because these orphans are often violent.

　　C. Because these orphans can turn to their brothers for help.

　　D．Because these orphans are too vulnerable.

　　【解析】　根据第三段的"...ignorance about how HIV is spread."可知，人们躲避那些孩子们是因为他们不知道艾滋病的传播方式，所以选A项。

　　【答案】　A

　　3．From the last paragraph，we can infer that ．

　　A．all children become orphans because of AIDS

　　B．many children have to look after their parents infected with HIV

　　C．there are three million orphans who live with HIV

　　D．millions of children are too poor to have teachers

　　【解析】　从最后一段的"Millions more have to care for sick parents..."推断出B项。

　　【答案】　B

　　4．The main idea of the passage is that ．

　　A．children have little knowledge of AIDS

　　B．children are easily infected with HIV

　　C．children whose parents died of AIDS live a hard life

　　D．children are badly treated when infected with HIV

　　【解析】　本文主要介绍了那些艾滋病孤儿的不幸的生活，所以选C项。

　　【答案】　C

　　B

As we enter into this new age of cities in which more than half the world's population will live in an urban area, we must also take a hard look at how we will care for the significant increase in our elderly population. While many will be living longer, they will be doing so with age­related health issues and disease.Of special concern, the