单项选择题

We must study English well, no matter ______ difficult it is.

A) what
B) however
C) how
D) that
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单项选择题
According to popular legend, a young goatherd discovered coffee by accident.
A) 根据流行的传闻，是一头山羊发现子咖啡。
B) 传说是一头山羊在吃草的时候碰见了咖啡，最后发生了事故。
C) 根据一个轶事，一个年轻的牧羊人发现了咖啡。
D) 据大众传说，一个年轻的牧羊人偶然发现了咖啡。
单项选择题
It is essential that we ______ measures to protect the ozone layer.
A) will take
B) should take
C) would take
D) took
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