3.First,
press the number 2, 3, and 0. Then press Power. Next press the number 7.
Finally press Start to begin cooking. 由短文中的“Suppose (假设)you want to cook a serving of broccoli 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.”可以知道若是需要两分钟四十秒的时间来做菜的话,则是这样来操作。由此可知要是做豆角的话,需要用时两分钟三十秒,则应按2,3,0这三个钮。再根据前面的说明,可不难找到答案。