单项选择题

What can be inferred about the swallows mentioned in the conversation

A．They are a type of insect.
B．They are a kind of fish.
C．They are a type of bird.
D．They are a type of pi
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单项选择题
No one would have time to read or listen to an account of everything ______ going on in the world.
A．it is
B．as is
C．there is
D．what is
单项选择题
Though he views himself as a realist, Cetron says that his findings make him very ______ about future.
A．optimistic
B．sympathetic
C．objective
D．precautious
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