“掩耳盗铃”是在_______处减弱声音的,无声手枪的“无声”是在_______ 处减弱的。
人耳 声源
亲和层析的基本原理是
A.离子交换
B.分子筛作用
C.利用大分子的生物学特异性来纯化该大分子物质
D.吸附平衡
E.分配平衡
So far we have done a lot to build a low-carbon economy, but it is _____ ideal. We have to work still harder. [ ]
A. next to
B. far from
C. out of
D. due to