用显微镜观察写有数字“68”的载波片，操作者
的视野里看到的图形是
A．89 B．86 C．98
答案：A
显微镜成的像是倒立的。
化坚汤功效与作用
There is so much noise in the yard that I can't ________ my attention on my work. [ ]
A. attract
B. pay
C. absorb
D. concentrate
