在局域网交换机中，交换机只要接收并检测到目的地址字段就立即将该帧转发出去，帧出错检测

A person _______ a foreign language must be able to use the foreign language　_______ all about his own.

A．to learn, to forget

B．learning, to forget

C．to learn, forgetting

D．learning, forgetting

―I hope to have a job like ________ in the future, Dad．

―Good, only if you ________ hard from now on．

A．you, will study

B．your, study

C．yours, study

D．yours, will study

核电站工作时，实现下列哪组能量的转化（　　）

A．核能转化电能

B．核能转化为内能，内能又转化为电能

C．核能转化为机械能，机械能又转化为电能

D．核能转化为内能，内能又转化为机械能，机械能又转化为电能

— Whom would you rather have ____ with you, Mary or Jane?  

— ___.[    ]

A. to go; Either

B. go; Either

C. gone; Neither

D. going; Anyone

关于药材大青叶和蓼大青叶的正确说法是（）

A.均含有靛蓝、靛玉红等成分

B.来源于同科不同种植物

C.来源于同一个属的植物

D.同种植物不同产地的药材

E.叶表面颜色一致