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单选题

A． It makes them clean and flee of germs.
B． It makes them more visible for the birds.
C． It makes them more nutritious.
D． It makes them softer.

参考答案A

解析: How does the preparation process affect the eggshells?
细节题。原文的制备过程提到You should save your eggshells and rinse them in water，then cook them lightly on the baking pan in the oven；set at a low temperature until they are dry but not brown．根据用水冲洗、用烤箱烘烤、低温处晾干等可知A正确。因此，正确答案是A。

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单选题

A． She is a good cook.
B． She collects birds' nests.
C． She likes to have birds visit her garden.
D． She is a professional gardener.

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单选题

A． They can determine the cost of construction.
B． They can reveal unsafe conditions for building.
C． They can show where landslides have occurred.
D． They can measure the rate of water drainage.

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单选题

A． It often interferes with construction.
B． It helps keep the soil in place.
C． It grows quickly after heavy rains.
D． It makes slopes unstable.

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