单项选择题

大孔型离子交换树脂具有体积交换容量大、生产工艺简单，成本低等优点。（）

A．对
B．错

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Where should we put our chopsticks in Chinese dinner table?
A、Put them down on the table
B、stick the chopsticks upright in the bowl
C、Hold them in hands all the time
D、Lay them on the bowl if no in use

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Please put your （）in upright position.

A.seat back
B.tray
C.desk
D.chair