【单选题】True, 10__________________________ but it's vital we find the rational ways of fishing before every ocean becomes a dead sea.
A.
some countries are beginning to deal with this problem
B.
some countries are beginning to deal with these problems
【单选题】一般认为与果蔬质构直接有关的酶是( )。
【单选题】从小说中的描述来看,元春的特长是( )。
【单选题】在化学实验中,必须遵守实验规则。下列做法违背实验规则的是 [ ]