When the fire broke out, Mary didn't know ___.


  1. A.
    what to do
  2. B.
    what do
  3. C.
    to do what
  4. D.
    what thing to do
A
Mary didn't know what to do意為: Mary不知道該做些什么?  what to do作know的賓語(yǔ).
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科目：高中英語(yǔ) 來(lái)源： 題型：閱讀理解

Many people like the feeling of the gentle wind in spring. Many like to see the falling leaves dancing in the wind in autumn. But sometimes, when the wind becomes a storm, it can be very destructive (毀滅性的).

A series of such storms struck the US last month and caused very serious damage and human pain.

Every year, major storms cause many problems around the world. There is nothing people can do to stop these powerful forces of nature. But new techniques are helping scientists to predict how, when, and where big storms will happen. The more exact scientists’ warnings are, the better people can prepare for the storms.

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If wind speeds reach 40 miles per hour, the system is called a “ tropical storm”, and it gets a name. At 75 miles per hour, it becomes a hurricane. Hurricanes that hit the US start when a thunderstorm forms off the coast Africa. Storms also develop over tropical waters in other parts of the world.

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R=" Reporter    " L =" Mr." Li

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