单项选择题

Why is there a hole in the weaverbird’s nest（）

A．To let in the sunshine.
B．To serve as its door.
C．To keep the nest cool.
D．For the bird to lay eggs.

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单项选择题
What does the nest built by a tailorbird’ look like（）

A．A basket.
B．A cup.
C．An egg.
D．An oven.
单项选择题
What’s the purpose of the scientists in studying tree tings（）

A．To examine the chemical elements in the Ice Age.
B．To look into the pattern of solar wind activity.
C．To analyze the composition of different trees.
D．To find out the origin of carbon-14 on Earth.
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