单选题：Which of the following statements is NOT a fact about Alvin?

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题目内容：
Which of the following statements is NOT a fact about Alvin? A．It can carry explorers as deep as 6, 500 meters.
B．It has played a key role in various important undersea expeditions.
C．It was launched in the sixties of the twentieth century.
D．It has been used for more than 40 years.

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