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单项选择题

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A.They are highly sensitive to cold.
B.They are a living part of our body.
C.They are a chief source of our pain.
D.They are vitally important to our life.
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单项选择题A.To limit discussion on heating bills.B.To prevent unnecessary heat loss.C.To control the temperature in the houses.D.To decrease the cost of energy-using.

A.To limit discussion on heating bills.
B.To prevent unnecessary heat loss.
C.To control the temperature in the houses.
D.To decrease the cost of energy-using.

单项选择题A.The sooner children begin to learn gardening, the better.B.Gardening teaches children to make their thumbs green.C.Gardening provides children with food.D.Gardening teaches children to cooperate.

A.The sooner children begin to learn gardening, the better.
B.Gardening teaches children to make their thumbs green.
C.Gardening provides children with food.
D.Gardening teaches children to cooperate.