皮皮学，免费搜题
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搜题
【判断题】
In Germany, smiles are often reserved for family, friends and social situations, and can be displayed freely in business settings.A.
正确
B.
错误
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Left ovary main venous drainage
A.
External iliac vein
B.
Internal iliac vein
C.
Inferior vena cava
D.
Common iliac vein
E.
None of the above
【单选题】The main hormone secreted by the corpus luteum of the ovary is
A.
oxytocin
B.
follicle-stimulating hormone
C.
estrogen
D.
progesterone