What does "impasse" probably mean? How did Dr. Edward Jenner solve the problem of smallpox?

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问题 What does "impasse" probably mean?
How did Dr. Edward Jenner solve the problem of smallpox?

选项 A、He kept on focusing on people who had smallpox.
B、He changed his way of thinking by turning to people without smallpox.
C、Dairymaids advised that he use cowpox to experiment.
D、He happened to discover cowpox and he experimented with it on dairymaids.

答案B

解析 文中段一中第三、四句,第三段第二句都解释丁Doctor E.Jenner是如何解决此问题的,故选B。
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