The system produces enough electricity to allow the temperature and humidity sensors to wirelessly send out signals four times a day, or immediately if there’s a fire. Each signal spreads from one sensor to another, until it reaches an existing weather station that sends the data by satellite to a forestry command center in Boise, Idaho.

　　Scientists have long known that trees can produce extremely small amounts of electricity. But no one knew exactly how the energy was produced or how to take advantage of the power.

　　28．What are the disadvantages of the remote automatic weather stations?

　　a. They cost too much.

　　b. They are of poor quality.

　　c. They are not enough.

　　d. They can’t reach remote places.

　　A．a, bB．b, dC．a, cD．b, c

　　29．Which of the following is the best sentence to fill in the blank?

　　A．Far water does not put out near fire.

　　B．All rivers run into sea.

　　C．Many a little makes a mickle.

　　D．It never rains but it pours.

　　30．What Shuguang Zhang said in Paragraph 4 means that ________.

　　A．a single tree is enough to generate much power

　　B．the power from the tree can’t be stored

　　C．trees can generate enough power for our life

　　D．a tree can produce the electricity to meet the needs of a sensor

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