49 What does the pronoun “it” in the third paragraph refer to?
(A)Rubber.
(B)An eraser.
(C)Brazil.
(D)An invention.

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統計： A(457), B(45), C(35), D(75), E(0) #1871165

詳解 (共 1 筆)

#3006697

 In 1839, a salesman was experimenting with a newproduct from Brazil called rubber. It could be used to make erasers, but it melted at high temperatures, and broke whenit was cold. The inventor tried mixing it with different chemicals, but nothing worked until he accidentally dropped iton a hot stove. Heat made the rubber strong and flexible. Thanks to Charles Goodyear’s accident, we now have rubbertires for our cars, and rubber soles for our shoes. 

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