单项选择题

在一块面积为10k2的地域内，已知在2k2的地域内种植植被，经过测量，所有植被的垂直投影面积为3k2，请问该地区的植被覆盖率为( )。

A.20%
B.30%
C.66.7%
D.10%
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单项选择题
The word 'tycoon' in the last paragraph is ______.A.derived from a Japanese word, meaning a businessman with great wealth and powerB.an English translation of a Russian word, meaning a man of great consequenceC.borrowed from Portuguese, meaning an industrialist with a great sum of money obtained illegallyD.rarely used now because of its derogatory meaning
A.A.derived
B.an
C.borrowed
D.rarely
单项选择题
通过 jQuery，选择器 $(“div”) 选取什么元素？（ ）
A．所有的div元素;
B．首个div元素;
C．id为div的元素;
D．类为div的元素
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