皮皮学，免费搜题
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【单选题】
社会营销观念产生于()A.
20世纪之前
B.
20世纪初～30年代
C.
20世纪30年代～50年代
D.
20世纪70年代至今
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
【多选题】巨噬细胞包括的免疫学功能有[2分]
A.
非特异性吞噬杀伤作用
B.
抗原提呈作用
C.
免疫调节作用
D.
产生特异性抗体
E.
具有与致敏CTL一样的对靶细胞特异性杀伤作用
【简答题】Which season is this Heatpump-working for?A. Cooling season B. Heating season
【单选题】Which season is the author’s favorite season?
A.
spring
B.
summer
C.
autumn
D.
winter
【简答题】Which season is the peak tourist season ?
【单选题】According to the passage which season is right?
A.
Spring is from January to March.
B.
The trees turn green in summer.
C.
Autumn is a busy season.
D.
We don't have many interesting sports in winter.
【单选题】When it is winter in China, which season is in Sydney?
A.
It is winter.
B.
It is spring.
C.
It is summer.
D.
It is autumn.
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