单项选择题

Oolong tea is . A.
completed fermented B.
semi-fermented C.
post-fermented D.
non-fermented

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多项选择题

兴隆热带植物园的珍惜植物有（） A. 咖啡 B. 胡椒 C. 见血封喉树 D. 龙血树

单项选择题

Somite formation in chicks proceeds

A．from anterior to posterior, as Hensen's node retreats
B．simultaneously along the axis
C．from posterior to anterior, as the primitive streak elongates
D．from the dorsal midline outward, into lateral plate