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.
11.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,b
B.b,d
C.a,c
D.b,c
答案:C
解析:细节理解题。文章第三段提到美国森林服务机构现在所采用的工具和方法花费高、分布少。故选C项。
12.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.
答案:C
解析:推理判断题。根据上下文可知此处为“积少成多”的含义,故C项适合。A项意为“远水救不了近火”;B项意为“条条江河归大海”;D项意为“不雨则已,一雨倾盆;不鸣则已,一鸣惊人”。
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