问题
单项选择题
据中国AECOPD流调数据显示有多少的患者半年内会因病情再次加重而入院？（）
A.40%
B.50%
C.60%
D.70%
答案
参考答案：B
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据中国AECOPD流调数据显示有多少的患者半年内会因病情再次加重而入院？（）
A.40%
B.50%
C.60%
D.70%
参考答案：B
When your mother want to tell you something, she uses words. Birds can’t speak 1._____ we do, but some birds can make sounds to warn their young of 2._______.They have 3.________own way of making the young birds do certain things. The jackdaw is a kind of black bird4.______lives in Europe. Jackdaws live together in flocks. Young jackdaws do not know their enemies. When an old jackdaw sees a dog, it makes a loud rattling5.______.The young birds know this sound means6._______is nearby. The sound warns them7._______their enemies. 8._______ a young jackdaw is in a 9______ place, a jackdaw parent 50._______over the young bird’s back from behind. The parent’s tail feathers move 11.______from side to side. It’s trying to say “12______”.At the same time, the 13.________bird calls out Key-aw Key-aw, which seems to say FLY HOME WITH ME. The young bird then follows the older14_______to go home. Young jackdaws15._______ learn what certain sounds mean. They know the meaning of these sounds from they hatch.
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