正确的实验操作是确保实验成功和安全的前提，下列实验操作中你认为符合规范的有______（填序号）．

A．蒸发液体时，不断用玻璃棒搅拌

B．稀释浓硫酸时，将水倒进盛有浓硫酸的量筒并搅拌

C．使用pH试纸前，将其均匀湿润

D．做一氧化碳还原氧化铁实验时，先通一氧化碳，再点燃酒精灯．

—Is that the small town you often refer to?

—Right, just the one ________ you know I used to work for years.

A．that

B．which

C．where

D．what