题目内容
9.听第10段材料,回答第18至20题.18.How did Europeans know the exact time in the late 1700s?
A.By looking at clocks at home.
B.By looking at clocks in factories.
C.By looking at clocks in public places.
19.What happened as a result of the industrial development?
A.The quality of watches was improved.
B.More types of watches were available.
C.Many more watches were produced.
20.What is this lecture mainly about?
A.The development of watches and clocks.
B.The functions of watches and clocks.
C.The importance of watches and clocks.
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