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【单选题】
( )婴幼儿比较常见的意外窒息事故原因A.
跌伤
B.
蒙被捂热
C.
耳朵有异物
D.
眼睛进异物
拍照语音搜题，微信中搜索"皮皮学"使用
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知识点：
皮皮学刷刷变学霸
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【简答题】已知数列{a n }满足：a 1 =1， a n+1 a n = 1 2 ，则数列{a n }是（ ） A．递增数列 B．递减数列 C．摆动数列 D．常数列
【简答题】If we're in good health, we are more able to resist disease. And if we're nutritionally deficient, or ____________________ with another disease, we're more likely to be susceptible.
【单选题】If you live in a city in North America or Europe, you have probably never thought much about water. Whenever you need some, you turn on the tap and there it is. Millions of people in other parts of th...
A.
pollution problems in general
B.
people in North America or Europe are living happier than those in other parts
C.
people drilling wells to check chemicals in well water
D.
underground water pollution
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