答案：C

　　19.A.production

　　B.delivery

　　C.value

　　D.time

　　解析：只要能够分析出delivery 所在的句子中their和them 指代的是assignments，就不难选出正确的答案。

　　答案：B

　　20.A.order

　　B.book

　　C.need

　　D.question

　　解析：have an immediate need for them “急需他们”。

　　答案：C

　　.阅读理解

　　A

　　Friends play an important part in our lives，and although we may take the fact of friendship for granted ，we often don't clearly understand how we make friends.While we get on well with a number of people，we are usually friends with only a very few­for example，the average among students is about 6 per person.

　　Moreover，a great many relationships come under the general term“friendship”.In all cases，two people like one another and enjoy being together，but beyond that，the degree of closeness between them and the reasons for their interest in each other vary greatly.

　　At the beginning ，much depends on how people meet ，and on good first impressions.As we get to know people，we consider things like age，race ，looks，economic and social status，and intelligence.

　　Although these factors are not of the greatest importance，it is more difficult to have a good relationship with people when there is a big difference in age and background.

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