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。()