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请说明DES算法的基本过程?

What do people do when they come to a fast food restaurant?

A. They order and eat their food at the restaurant.
B. They buy and take their food out and eat it in their cars or in their homes.
C. They order, pay for and get their food in their cars.
D. They do one of the three above-mentioned things.

什么是入侵检测系统?

The landlord asked the boys to eat in the house because _______.

A. he was afraid the dog would eat their food
B. he was afraid the dog would bite them
C. he thought other people would see the bad food for the boys
D. he was afraid the boys would play with the dog

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