It's difficult to ____ one state of matter from another.A differ B vary C distinguish D changeIt's difficult to ____ one state of matter from another.A differ B vary C distinguish D change选哪个?为什么?

It's obviously more difficult to swim __ the stream than __ the stream.介词填空 It's obviously more difficult to swim __ the stream than __ the stream.介词填空 do you like math? no,it's __ difficult for me to learn it. It's difficult to choose! It's difficult to do sth 还是It's difficult doing sth It's difficult it's difficult for 让杰克每天晚上复习两个小时功课恐怕很困难 it's difficult to __ going over his lessons for two hours 8.7 It is __ for us to deal with. A.an enough difficult situation B.such a difficult situationIt is __ for us to deal with. A.an enough difficult situation B.such a difficult situation C.too difficult That's not __ .Ican do it .A:easy enough B:enough easy C:difficult enough D:enough difficult it's difficult to/for有什么区别?it's difficult to和it's difficult for有什么区别?没有上下文喔句型、翻译等方面说吧 6.32 Matters are very __ .It's very difficult to find a single solution to all the problems.Matters are very __ .It's very difficult to find a single solution to all the problems.A.complex B.vital C.unbearable D.imaginary请说明理由, It's not difficult ____(learn) to skate. 用It's difficult to do sth.造句 It's difficult to love everyone什么意思 It's difficult to d____ between the two difficult的反义词It·s（ ）to carry It's difficult to find right shoes for his f_____.