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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单项选择题
What happens to trees each year
A．Their tings get thinner and thinner.
B．They add a ring of wood.
C．Their rings get darker in color.
D．They become more valuable.
单项选择题
What do we find out about Dick' s personality
A．His writing talent was natural.
B．He was a compulsive drinker.
C．His work improved as he matured.
D．He could not adjust to a changing world.
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