单项选择题

The word "therefore" in paragraph 2 indicates that a （）.

A．speech is beginning
B．conclusion follows
C．comparison is being made
D．metaphor is being used

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单项选择题
Which animals in this passage are bred by scientific methods（）

A．Poultry.
B．Geese.
C．Birds.
D．Chickens.
单项选择题
24（）

A．plants
B．trees
C．rubber
D．streets
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