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【单选题】

2017年,一颗诡异星体(学术界将其命名为“奥陌陌”)闯入太阳系,与太阳“擦肩而过”,之后又迅速飞出太阳系。奥陌陌整体呈长条雪茄形,长宽比超过极端彗星或小行星数倍之多,如果是自然天体,早就会因自转或其他天体引力而发生折断。由此,某天文专家大胆断言,奥陌陌是外星文明的科技产物。下列哪项如果为真,最能支持上述天文专家的断言?()

A.
奥陌陌表面的反射率至少是太阳系小行星的10倍左右
B.
奥陌陌飞越太阳系时并未显示欲主动与人类交流的迹象
C.
奥陌陌离开太阳时突然加速,完全不同于其他自然天体
D.
奥陌陌接近太阳时没有长尾巴,而接近太阳的慧星却有
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【单选题】Unless we spend money to spot and prevent asteroids (小行星) now, one might crash into Earth and destroy life as we know it, say some scientists. Asteroids are bigger versions of the meteoroids (流星) that...

A.
It is very unlikely, but the danger exists.,
B.
Such a collision might occur once every 25 years.
C.
Collisions of smaller asteroids with Earth occur more often than expected.
D.
It’s still too early to say whether such a collision might occur.

【单选题】系统命名为(   )

A.
1-甲基-1-戊烯-4-炔
B.
2-烯-5-己炔
C.
4-己烯-1-炔
D.
1,3-二甲基环己二烯

【单选题】将/newdir/other/pass1重命名为passwd。

A.
Mv /root/newdir/other/pass1 /root/newdir/other/passwd
B.
Mv /root/newdir/
C.
Mv /root/newdir/other/passwd
D.
Mv /root/newdir/other/pass1