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 terribleB．Whenever good C．If worseD．When bad
D
考查狀語從句的省略。根據(jù)句子，可知前后是對(duì)比相反情況，所以前面是When it’s good,，后面應(yīng)是When it is bad,it is 可以省略，所以選D。
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