国土及依附于国土的( )是一国进行经济社会活动的基本条件。
A．自然资源
B．环境治理
C．生产力
D．环境保护
参考答案：A
—Our P.E. teacher isn’t as young as he _______, is he?
—No, but he is one of _______ in our school.
A．looked; the youngest teacher
B．looks; the youngest teachers
C．looks; the oldest teachers
D．looked; the oldest teacher
氢油比对催化剂的性能影响不大，但增加氢油比能减慢催化剂积炭的速度。（）
