The passage mainly tells us ______. Which is not true according to the passage? ______.

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问题 The passage mainly tells us ______.
Which is not true according to the passage? ______.

选项 A、American researchers’ findings show that short-term increases in ozone lead to higher death rates in cities.
B、Ozone is not a form of oxygen.
C、Ozone has been connected with heart and lung problems.
D、Researchers say they found an increase in deaths even below the present levels.

答案B

解析 从第二段的第一句话可以判断B是错误的。
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