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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单项选择题

What does the word discount (Para. 1 ) most probably mean according to the context

A．Doubt
B．Accept
C．Discharge
D．Disregard

单项选择题

A business lunch can be viewed as successful if______.

A．good relationship is established
B．the client does not have to pay
C．the client likes the food extremely
D．business is touched upon during the lunch