题目内容：
Questions are based on the passage you have just heard.[A] In the second half of the 19th century.
[B] In the 1960s.
[C] In the first half of the 20th century.
[D] In the early 1800s.
参考答案：
答案解析：
单选题：Questions are based on the passage you have just heard.[A] I
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- 题目类型：单选题
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[A] In the second half of the 19th century.
[B] In the 1960s.
[C] In the first half of the 20th century.
[D] In the early 1800s.