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计算机必须做好系统软件的备份，有力保证系统的正常运行。( )
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Supermarket’s New StrategyOne supermarket in Tokyo has managed to solve the problems of shoplifting, mistakes by cashiers, and long lines of customers waiting at the cash registers. It is Japan’s advanced computer technology that has come (51) with the answers.Shoppers at an OK supermarket on the outskirts of the city now push a cart (52) a plastic card chained to it and buy from glass cases where the goods are on display. The plastic card has a magnetic number imprinted on it. Each customer carries his or her own card, which is (53) at the exit. While shopping, the customer pushes the card into a slot beside whichever items are wanted and pushes a button or two. The glass covered vending machines are connected to a computer that (54) the price of every item in the store. Prices of every purchase are added up automatically. (55) she has finished shopping, the customer hands her card to a cashier who (56) it into the register. A second later the (57) pops out.Shoplifting is physically impossible. Once you touch a commodity the computer remembers it no matter how you hide it or (58) you eat it on the spot.A cashier at the OK supermarket is now able to work 15 times faster than her (59) at a conventional supermarket. Only two cashiers, (60) , are required at the store, which (61) 2,500 separate items. One man is enough to keep the vending machine filled, because whenever the stock for a certain commodity is (62) to run out, a red lamp in the computer-room (63) him.But there are disadvantages too: a customer cannot (64) his or her mind about a purchase. Once touched, the item cannot be put back. The customer must (65) a cashier with it first and get a refund later. There are also no fresh vegetables or fish on sale—everything is prepackaged. 54（）。
Being safe in your everyday life needs knowledge. If you remember the following information, your life will be much safer. ·Always notice the environment around you. You shouldn’t walk alone outside. Make sure where the public phones are. If anything dangerous happens, you can find them easily. · Your bag should be carried towards the front of your body instead of putting it on your back When a bus is full of people, it is easy enough for a thief to take away the things in the bag on your back. · If you are followed by someone you don’t know, cross the street and go to the other way, let the person understand that you know he or she is after you. Next, don’t go home at once. You are safer hi the street than you are alone in your home or in a lift(电梯). · If you have to take a bus to a place far away, try to get to the stop a few minutes earlier before the bus leaves. This stops other people from studying you. On the bus, don’t sit alone. Sit behind the driver or With other people. Don’t sleep. You’d better put your bag ______ when there are too many people on the bus.
(由单选和多选组成) 2004年1月某企业发行一种票面利率为6%，每年付息一次，期限3年，面值100元的债券。假设2004年1月至今的市场利率是4%。2007年1月，该企业决定永久延续该债券期限，即实际上实施了债转股，假设此时该企业的每股税后盈利是0.50元，该企业债转股后的股票市价是22元。请根据以上资料回答下列问题： 按照2007年1月的市场状况，该股票的市盈率是( )。
Tom gave us some sweets to eat.→ We ______ some sweets to eat______.
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