antarctic ozone/amn

11.   ----- NASA holds a briefing to discuss new evidence that man-made chlorine in the stratosphere is the cause of the Antarctic ozone hole.

a. + ozone >>共 97 个
high 9.09%
antarctic 5.88%
low-level 5.35%
federal 4.81%
stratospheric 4.81%
low 3.74%
worst 3.21%
protective 2.14%
arctic 2.14%
highest 2.14%
antarctic + n. >>共 106 个
water 8.09%
ice 7.77%
coast 3.88%
base 3.56%
ozone 3.56%
summer 3.24%
winter 2.91%
toothfish 2.59%
sanctuary 2.59%
whale 2.59%
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