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【单选题】
Q: Why does Dan think alien life doesn’t exist? 1 extra-terrestrial [ˈekstrə təˈres trɪəl] n. 外星人 2 alien [ˈeɪlɪən] n. 外星人
A.
Because scientists have found nearby sun-like stars.
B.
Because they have had over 60 years to find us.
C.
Because they have had 13 billion years to make an appearance.
D.
Because they have the same technology as we do to travel.
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题目标签：外星人
参考答案：
参考解析：
刷刷题刷刷变学霸
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