题目内容
"Prioritize" in the third paragraph means______.
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Which of the following can best summarize the passage？
Ozone problems first became known in 1985. British scientists reported that ozone levels in the Antarctic atmosphere near the South Pole fell sharply each year in October and November. 1987 was the first year that a huge hole developed in the ozone layer above the Antarctic.
A recent study of the atmosphere over the Arctic area near the North Pole showed extreme thinning of the ozone. Officials from the American space agency said the latest study is a result of the largest campaign yet to measure ozone amounts and changes in the Arctic area. NASA researcher Paul Newman said some of the measurements show ozone in the Arctic decreased about sixty percent between January and the middle of March. These measurements are similar to the ozone losses observed in this area a few years ago.
Other studies have shown that man-made chemicals were destroying ozone in the atmosphere. An international agreement halted production of the most harmful chemicals. The new findings support the idea that recovery of the ozone layer may be delayed.
Ozone is______.
"The Nile is a highway for the people of Egypt" means______.
In the fertile valley of the Nile______.
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