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( ) 电信产品展销会 ( ) 自行车展销会

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For each blank, choose the best answer from the four choices and write down on the answer sheet.In (1) the strength of the carrier signal is varied to represent binary 1 or 0. (2) is a system that can map a name to an address and conversely an address to an name. (3) is a three -way handshaking authentication protocol that it’s packets are encapsulated in the point - to -point protocol. (4) is an approach that enables an ATM Switch to behave like a LAN switch. (5) is an guided media which is made of glass or plastic and transmits signals in the form of light. 2（）

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(Give)______more time and fund, the scientists will be able to work out good solutions to the environmental problem.

( ) 礼品文具展销会 ( ) 纺织品与服装展销会

Humans, like other animals, have a(biology)______clock that tells us when to sleep and eat.