单选题：When did dinosaurs become extinct?

题目内容：

When did dinosaurs become extinct? A．300 million years ago.
B．250 million years ago.
C．60 million years ago.
D．65 million years ago.

参考答案：

答案解析：

Which of the following is an implication of physical fitness

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There are more men physicians than women physicians in the US.A．Right B．Wrong C．

分类：卫生类题型：单选题