阅读与回答问题

　　Before you use your new microwave oven(微波炉), read the instructions carefully．Each oven has its own control panel(控制板),but most microwave ovens operate in a similar way．Look at the control panel first．It shows the time at the top of the panel．Under the time are the different functions(功能)．You can press DEFROST, COOK, CLOCK, or POWER．You can also warm food by pressing REHEAT TIMES．

　　Under the functions are the numbers．These numbers are shown as on a calculator, from zero to nine．You can press the numbers to set the cooking time in seconds or minutes．Under the numbers are START and CLEAR．

　　A microwave oven will automatically(自动的)cook on HIGH(power level 10)unless you enter a lower level．Suppose you want to cook a serving of broccoli(花茎甘蓝)for two minutes and forty-five seconds on MEDIUM power(level 5)．First, press the numbers 2,4 and 5(two minutes, forty-five seconds)．Then press Power．Next press the number 5．At last, press Start to begin cooking．If you make a mistake, press Clear．This will clear the display and allow you to start oven again．

1．What is the main idea of the passage?

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2．What functions does a microwave oven have?

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3．How would you cook green beans for two minutes and thirty seconds at power level 7?

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4．What is the last function you press each time you set the controls?

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5．What does Clear allow you to do when you press it?

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