【单选题】You need to rewrite this sentence because it is ______ the readers will have difficulty in understanding it.
【单选题】In the sentence 'To do this, we need to persuade mankind.' (Para. 1), 'this' refers to ______.
C.
solve international problems
【单选题】再生器中旋风分离器用来分离( )和催化剂
【单选题】The sentence needs _______once more.
【单选题】You need to rewrite this sentence because it is ______ . The readers will have difficulty in understanding it.
【简答题】妊娠3个月,右肾结石,大小0.6cm( )