单项选择题

The author thinks that ______.

A．it is impossible that we encounter some alien form of life
B．life only exists on Earth
C．it is likely that we'll encounter some alien form of life
D．beings from outer space will never visit the earth

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热门试题

单项选择题

The overall development of the passage can best be described as ______.

A．refuting possible explanations for certain phenomena
B．documenting a thesis with specific examples
C．offering an explanation of the series of events
D．making particular proposals to solve a problem

单项选择题

What does the word discount (line 6, Par

A．1) most probably mean according to the contextA. DoubtB. AcceptC. DischargeD. Disregard