单项选择题

What might surprise us about birds’ nests according to the speaker（）

A．Some are built underground.
B．Some can be eaten.
C．Most are sewed with grasses.
D．Most are dried by the sun.

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单项选择题
What is the ovenbird’s nest made of（）

A．Branches.
B．Grasses.
C．Mud.
D．Straw.
单项选择题
What do we learn from the passage about solar wind activity（）

A．It affects the growth of trees.
B．It has been increasing since the Ice Age.
C．It is determined by the chemicals in the air.
D．It follows a certain cycle.
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