B

　　(2017·沈阳四校协作体月考)

　　Bluegills, which are small enough to fit in your hand, are the fish that are protecting our water. They are common freshwater fish native to America and are also known as bream or sunfish. According to the Associated Press, the bluegills were originally used by the Army to make sure water was safe. Now San Francisco, New York City, Washington D．C and several other cities use the bluegill monitoring system.

　　The bluegill system works by constantly filling the fish tank with city or town water. A small group of bluegills swim in the local water and are closely monitored. Bluegills are very sensitive to their environment. Changes in the environment cause their behavior and breathing patterns to change. They cough if the water is polluted. Fish cough by flexing their gills(鳃)to get rid of unwanted particles, like grain of sand, from their breathing passages. If the bluegills are coughing the computer sends an alarm via email. The bluegills in New York City discovered an diesel spill(柴油外溢)hours before the usual monitors. Adding the bluegill system to regular water protection methods resulted in an early warning and safer water.

　　文章大意：Bluegills这一美国土生土长的小鱼成为了人们饮用水是否安全的检验试金石。

　　60．People use the bluegill system to monitor water supplies________.

　　A．because they have high sensibility to their environment

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