Thereply,whenitfinallycame,was________thenegative.
A、forC
in the negative：否定的，否决。
Thebasicunitinthestudyofmorphologyis______.
Lyingundertheskull,thehumanbraincontainsanaverageoftenbillionnervecellscalled______.
Youngerchildrenarecurious________howthingswork，andmanyofthemwanttotakeaparteverythingwithintheirreach.
_______isafactthatEnglishisbeingacceptedasaninternationallanguage.
Thisisanimportantproblem_______toofewsocialscientistshaveresearched.
