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患者，男，25岁，须发早白，小便带血热痛，口臭，舌红，苔薄黄，脉滑数。

针对须发早白，宜首选的药物是（）

A.白茅根

B.槐花

C.侧柏叶

D.苎麻根

E.地榆

答案

参考答案：C

选择题

人工种子又称合成种子或种子类似物，它是20世纪生物技术在农业上的应用之一。人工种子在培养过程中具有繁殖速度快、数量多并能保持母体优良性状的特点，它的关键是发育成具有完整个体结构的胚状体，此胚状体可通过下列哪项生物技术获得[ ]

A．组织培养

B．细胞融合

C．基因重组

D．杂交育种
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单项选择题

Since RAM is only active when the computer is on, your computer uses disk to store information even when the computer is off. Which of the following is true （ ）

A．When your computer is on, only RAM is used to store information.

B．When your computer is on, only disk drives are used to store information.

C．When your computer is off, only RAM is used to store information.

D．When your computer is off, only disk drives are used to store information.
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