31. What is the main idea of the passage?
(A) Severe weather in Kansas every spring.
(B) Storms and temperature changes in the Americas.
(C) Tornadoes are the main concern in the US.
(D) High temperatures in Canada.
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統計: A(0), B(8), C(0), D(0), E(0) #3442599
統計: A(0), B(8), C(0), D(0), E(0) #3442599