知道“人总是要死的”是一个()。
A.必然知识
B.偶然知识
C.后天必然知识
D.先天偶然知识
参考答案:C
亚马孙雨林对全球水循环和水平衡的作用,主要表现在( )
A.通过光合作用放出氧气
B.起着类似海绵的作用,滞蓄大量降水
C.亚马孙雨林所涵养的水量约占地表淡水总量的50%
D.亚马孙雨林的降水量绝大部分是自身产生的
Had she _____ her promise, she would have made it to Yale University. [ ]
A. looked up to
B. lived up to
C. kept up with
D. come up with