以下表述正确的一组是:()①调值就是声调的高低升降曲直长短的形式;②调类就是把一种语言中所有的调值加以归类后得出的类别;③阴平、阳平、上声、去声标记了声音的调值;④调值是声调的“实”,调类是声调的“名”。
Othersarguethatsincetheearthhasenduredalongstringoficeagesinthelasttwomilliontothreemillionyears,anywarmingis________tobetemporary.
In1991,whilet11eeconomiesofindustrializedcountriesmetaneconomic_____,theeconomiesofdevelopingcountriesweregrowingveryfast.
Aftersomanydayswithoutrain,thegroundquickly________thelittlerainthatfelllastnight.