单项选择题

Why is a "secondary succession" quicker

A．The ground is more suitable.
B．There is more space for new plants.
C．Birds and animals bring new seeds.
D．It is supported by the forest.
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单项选择题
According to the passage, why do people buy tickets to a concert
A．Because they want to know some musicians.
B．Because they want to entertain themselves.
C．Because they want to learn music.
D．Because they don't want to stay home.
单项选择题
What can be inferred from the passage
A．The manufacturers who can better read customers' mind will do better.
B．Sometimes customers may decide to buy something all of a sudden.
C．Not so many customers buy the products displayed on the bottom shelves.
D．Some of the people buy cars to show them off.
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