问题
单项选择题
In the last 10 years we have all witnessed an impressive growth in our knowledge about the environments.
A．imperative
B．observable
C．sustainable
D．expressive
答案
参考答案：B
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In the last 10 years we have all witnessed an impressive growth in our knowledge about the environments.
A．imperative
B．observable
C．sustainable
D．expressive
参考答案：B