单项选择题

What causes differences in size and color of annual rings

A．The climate.
B．The exposure to light.
C．The length of time.
D．The fertility of the soil.
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The World Trade organization holds its summit on______.
A．Nov. 30
B．Nov. 13
C．Dec. 30
D．Dec. 13
单项选择题
What are the kids’ names
A．Henry and Jerry.
B．Henry and Jessie.
C．Jerry and Jessie.
D．None of the above.
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