Clones are still rare. They cost a lot and are difficult to produce.

　　The F．D.A.says most food from cloning is expected to come not from clones themselves, but from their sexually reproduced offspring. It says clones are expected to be used mostly as breeding animals to spread good qualities.

　　Public opinion studies show most Americans do not like the idea of food from cloned animals. But this research also shows the public knows little about cloning.

　　Cloning differs from genetic engineering. A cell taken from a so­called donor animals is grown into an embryo(胚胎)in the laboratory. Next, the embryo is placed into the uterus(子宫)of a female animal. If the process is successful, the pregnancy reaches full term and a genetic copy of the donor animal is born.

　　【语篇解读】 用克隆动物制造的食物是否安全，已经得美国各界人士的关注……

　　48. From the passage we know that________.

　　A．foods from cloned animals are popular in America

　　B．cloned adult animals are safe to eat except sheep

　　C．cloned animals will be easy to produce

　　D．most foods from cloning is expected to take place of other foods

　　解析　推理判断题。从文中第二段可推出。

　　答案　B

　　49．The main purpose of the text is to________.

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