19．Why did Rachel Carson change the theme of her writing?

　　A．World War Ⅱ caused a lot of suffering.

　　B．Modern technologies improved nature.

　　C．The environment was greatly damaged.

　　D．Too many chemical pesticides were used.

　　20．The text is mainly about________.

　　A．how to protect marine animals

　　B．the life story of Rachel Carson

　　C．environmental protection in the U．S.

　　D．the side effects of chemical pesticides

　　Ⅲ.任务型读写

　　A smart card is a card that is carried with either a microprocessor and a memory chip or only a memory chip that is not programmable.The microprocessor card can add, delete, and deal with the information on the card, while a memory-chip card can only do one thing.

　　Smart cards, unlike magnetic stripe cards, can do many different things and hold a lot of information.In this way, they do not need to get information from a faraway place when they are used.

　　Today, there are several kinds of smart cards, all of which are very popular in the market: IC (Integrated Circuit) Microprocessor Cards (Chip Cards) offer a larger memory and better security than the traditional magnetic stripe cards do.Chip cards can also hold data. These cards are used for many things.Thus, chips have been the main platform for cards that hold a secure digital identity.Some examples of these cards are：

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