皮皮学，免费搜题
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【多选题】
以下关于生态学研究(ecological study), 说法 错误的是A.
只是一种粗线条的描述性研究
B.
以个体为观察、分析单位
C.
生态学谬误可以避免
D.
不能直接测量发病率
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】There are some boys______soccer on the playground. [ ]
A.
play
B.
to play
C.
playing
D.
are playing
【单选题】There are some boys ________ in the river.
A.
swimming
B.
to swim
C.
are swimming
D.
is swimming
【简答题】（）型谈判者把对方不当作敌人，而看作朋友。
【简答题】Watching the video and Trying to translate it. 2.What are the operations of this company ? 3. What's the man's name? 4.What is the position of the man? 5. What did the customer service manager make th...
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