C) the worry about asteroids can be left to future generations since it is unlikely to happen in our lifetime
D) workable solutions still have to be found to prevent a collision of asteroids with Earth
25.Which of the following best describes the author s tone in this passage?
A) Optimistic.
B) Critical.
C) Objective.
D) Arbitrary.
答案:21.B 22.A 23.B 24.D 25.C
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