化学用语是我们学习化学的工具，它们分别具有各自的意义。下列化学用语只有微观意义的是 [ ]
A．Cu
B．Cl2
C．2N
D．CO2
答案：C
— Sorry, but I need a bit more time to find my lunch box.
— _____!We'll be late for the picnic.
A. Don't worry
B. Take your time
C. Take it easy
D. Come on
范围缩放可以显示（）范围并使所有对象最大显示。
