28. People set up the "blood bank" so that they can

　　.

　　A. give the right kind of blood to the people who need it in time

　　B. keep different groups of blood as much as possible

　　C. make it easier to sell or buy blood

　　D. keep blood for more than twenty hundred years

　　29. From the last paragraph (段落) of the passage, we learn that

　　.

　　A. the writer thinks it's good to give blood to a "blood bank"

　　B. we may become ill if we give blood to a "blood bank"

　　C. many people died because they lost a lot of blood

　　D. blood is more important than money

　　30. The writer doesn't talk about

　　in the passage.

　　A. how important blood is to us

　　B. the four groups of blood

　　C. where the blood bank is

　　D. what "blood transfusion" is

　　B

　　American is a mobile society. Friendships between Americans can be close and real, yet disappear soon if situations change. Neither side feels hurt by this. Both may exchange Christmas greetings for a year or two, perhaps a few letters for a while—then no more. If the same two people meet again by chance, even years later, they pick up the friendship. This can be quite difficult for us Chinese to understand, because friendships between us flower more slowly but then may become lifelong feelings, extending (延伸) sometimes deeply into both families.

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