更多"Microwaves are ______."的相关试题:
[单项选择]Microwaves are ______.
A. absolutely safe at low levels
B. very efficient for cooking
C. cancer-causing iii people with weak eyes
D. completely understood by scientists
[单项选择](Alike) light (waves), microwaves (may be) reflected and (concentrated).()
A. Alike
B. waves
C. may be
D. concentrated