单项选择题

Scientists are always studying the ______ of nature.

A．phenomenons
B．phenomenon
C．phenomenas
D．phenomena
<上一题 目录 下一题>
热门 试题

单项选择题
We all like the boy ______
A．often years old
B．ten-year-old
C．at ten old
D．of age often
单项选择题
Every year ______ watch NBA on TV.
A．million people
B．millions of people
C．millions people
D．million of people
相关试题