下列选项中括号内物质为杂质，右边为除杂试剂，其中不合理的是（ ）
| A．氯化钠固体 (碳酸钙) 水 |
| B．氧气(水蒸气) 浓硫酸 |
| C．硫酸亚铁溶液(硫酸铜) 铁粉 |
| D．一氧化碳(二氧化碳) 灼热的氧化铜 |
This is my beautiful school is near the famous library.
| A． | where | B． | which | C． | who | D． | when |
--- Can you tell me ______ on the Internet? --- OK, mum.
| A． | how can I use QQ | B． | where can I use QQ |
| C． | how I can use QQ | D． | whether can I use QQ |
Thousands of houses _______ by the floods in Guangxi last month.
| A． | destroy | B． | destroyed | C． | have destroyed | D． | were destroyed |
more, and you'll improve your spoken English.
| A． | Speak | B． | Speaks | C． | Speaking | D． | To speak |
--- I've just got a postcard from my pen friend.
--- Let me have a look
. Wow.nice card!
| A． | What | B． | What a | C． | How | D． | Why |