2. 外语
  3. Do you forget to turn off the lights and heaters when you go out of a room? In 2040 it【C1】______not matter. They will turn thems

Do you forget to turn off the lights and heaters when you go out of a room? In 2040 it【C1】______not matter. They will turn thems

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问题     Do you forget to turn off the lights and heaters when you go out of a room? In 2040 it【C1】______not matter. They will turn themselves off and on again when you【C2】______. You will choose the temperatures for each room, the lighting and the humidity. A sensor【C3】______the presence of a human(and, with luck, ignore the dog!)and turn the systems on, and when the humans【C4】______it will turn them off again.
    The sensors will work through the central home computer and they will do【C5】______more than just turn the fires and lights on and【C6】______for you. They will detect【C7】______electrical appliances, plugs or switches, isolate them【C8】______they cannot harm anyone, and then【C9】______you that they need repair. They will detect fire and if you are out of the【C10】______, the computer will call the fire brigade. It will also【C11】______the police【C12】______the sensors detect【C13】______intruder. This will not be too difficult【C14】______the locks on the outside doors will be electronic. You will open them using your personal card — the one you use for shopping — maybe using a【C15】______known only to you.
    It will be【C16】______to lose the keys, and a housebreaker will have to【C17】______with the lock or with a window. It is not very difficult to make such tampering and【C18】______a signal to the computer.
    The computer will be more than a fireman-policeman-servant. It will be an【C19】______, and most of your entertainment will come right into your home. It does now, of course, but by 2040 " entertainment" will mean much more. For one thing, you will be able to take part【C20】______, rather than just watching.
【C9】
选项 A、warns
B、warned
C、warning
D、warn
答案D
解析 语法知识。分析句子的结构，句中的and提示空格填入的词语的主语为They(The sensors)，与前面的detect构成并列谓语，因此填入动词原形即可。故答案为D。
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