强化对浸渍管的烘烤以不小于（）小时为宜。
A.5
B.16
C.9
D.12
参考答案：D
Choose the right answer to fill in the blanks. (看图完成句子)
A. Thank you.
B. Good morning.
C. Nice to meet you, too.
D. Where are you from?
A: Good morning!
B: 1______________
A: This is my friend, Nancy
B: Nice to meet you.
C: 2______________
B: 3______________?
C: I am from the USA.
B: Welcome to our school!
C: 4______________
