A giant helium(氦) balloon is telling res
题型:选择题
问题:
A giant helium(氦) balloon is telling residents of Paris how good or bad the air quality is. When it’s good, the balloon ----measuring 22 meters wide and 32 meters high---shines green. _________, it’s red.
A.Though terrible
B.Whenever good
C.If worse
D.When bad