我的理解是its 只能指代surface minning,但是it的话可以指代surface minning或者 deaper mining.这个句子可能需要从逻辑结构上分析：Sm is safer than dm,but its toll is greater.
SAT语法题surface minning is safer,quicker,and cheaper than deap
1个回答
相关问题
-
Running is c______ and safer than sking.
-
Traveing by train is _____cheaper and _____engoyable than a
-
SAT语法题there is probably no story more dramatic( than basebal
-
sat语法题!平时都说 he is better than me但是 no one is sorrier than i
-
一道SAT语法题The tiles are sorted not only by their surface appea
-
SAT语法题Becasue earth's gravity is greater than the moon's,the
-
SAT语法题,1.The library is (older than it but still just as bea
-
Shopping is cheaper than a psychiatrist.
-
一道SAT语法题--IS from princeton
-
Jim's bike is cheaper than____(Tom)