填空题

This is a (health) ______ place--fresh air, plenty of sunshine and clean water.

【参考答案】

healthful
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In order to breathe, what did the mother put over their faces______.
单项选择题
Birds don’t get lost on their migratory flights, and the reasons ______.
A．have been known to scientists for years
B．have only recently been discovered
C．are known by everyone
D．will probably remain a mystery
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