单项选择题

In arithmetic, a number stands for the size of a set of things.

A．measures
B．estimates
C．cancels
D．represents
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单项选择题
To date, scientists have not yet detected this form of life... (paragraph 5) What does this form of life refer to
A．Gas-based life.
B．Methane-based life.
C．Water-based life.
D．Liquid-water-based microorganisms.
单项选择题
What can be inferred from what Allen said
A．Scientists have different arguments over whether there is life on Titan.
B．Scientists all agree that a non-biological chemical reaction is a possible explanation.
C．Scientists all suggest that a biological explanation is reasonable.
D．Scientists all agree that there is life on Titan.
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