糖尿病酮症时酮体阳性指哪项（） A.生酮氨基酸 B.β-羟丁酸 C.丙酮酸 D.乙酰
题型：单项选择题
问题：
糖尿病酮症时酮体阳性指哪项（）
A.生酮氨基酸
B.β-羟丁酸
C.丙酮酸
D.乙酰乙酸、丙酮酸、β-羟丁酸
E.乙酰乙酸、β-羟丁酸
题型：单项选择题
阅读理解。
Canada Geese are large blue and white birds. When autumn comes. they have to move to south where
the weather is warmer. The winters are so cold in Canada that the birds will die if they stay there.
Last spring, Bill and a man found sixteen young Canada Geese on his farm. They had lost their way. Bill
thought, "These young birds won't know what to do in the autumn." He had a small plane and he decided to
teach the birds to follow him. All through the summer, he went on short trips in his plane and the young geese
new after him.
When the cold weather arrived in the autumn,Bill flew to Virginia in the United States. 600 miles South of
his home in Canada. The geese followed him all the way. Bill left the geese in Virginia and he returned home.
This spring,Bill was waiting for the birds to come back. They didn't arrive, so Bill flew to Virginia to get
them. He looked for them for two weeks but he couldn't find them. When he arrived back home, he found the
geese waiting for him. They had found their way home without him!
1. What will happen to the geese if they stay in Canada in winter?
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2. Where did Bill find sixteen young geese last spring?
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3. Is it 600 Bill far from Bill's home to Virginia?
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4. How long did it take Bill to look for the geese in Virginia?
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5. The geese found their way home by themselves, didn't they?
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