(单选题)

How many plant species known to science are at the risk of extinction?

A.About 20

B.About 2, 000

C.About 82, 000

D.About 390, 900

参考答案：C

参考解析：

推理判断题。根据文章第四段第一句“The report, called the ‘State of the World’s Plants,’ estimates that there are currently 390,900 plant species known to science, not including algae or moss”和最后一句“And some 21 percent of those plants are threatened with extinction, according to the report”可知，这份名为“世界植物状况”的报告估计，现在已知的植物有390900种，其中不包括藻类和苔藓类植物，报告称，21%的植物面临着灭绝的威胁。因此，有82089种科学上已知的植物物种面临灭绝的危险。故选C。

知识点：阅读理解四选一英语专业基础知识阅读理解教师招聘-小学英语