题目内容
16.听第十段材料,回答第17至20题.17.What kind of difficulties did Chester have while skating?
A.He had nobody to play with.
B.The skating shoes wore out quickly.
C.His ears got too cold to stay out for a long time.
18.Which of the following was used in Chester's invention?
A.Wire.B.Plastic.C.Cotton.
19.What happened to Chester at the age of 18?
A.He had his own factory.
B.He made 30,000 dollars a year.
C.His invention was recognized by the government.
20.What is the talk mainly about?
A.How to be a successful businessman.
B.How an invention first came into being.
C.How to keep warm in winter.
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