（）最富有灵活性，但是花费成本较高。
A.电话访问
B.人员访问
C.邮寄问卷
D.现场问卷
参考答案：B
用所给单词的适当形式填空。
1. — Where ____ you ____ (go)?
— I ____ (take) my daughter to the park.
2. — Are you still busy?
— Yes, I ____ (finish) my work, and it won't take long.
3. They ____ (work) on the farm now.
4. Listen! The couple ____ (quarrel) in the room.
5. — You're drinking too much.
— Only at home. No one ____ (see) me but you.
钟罩式气体流量标准装置不能用动态法检定燃气表。（）
