Itisnotdecided________theconferencewillbeheld.
A、whatC
A 什么 B 哪一个 C 什么时候 D (无词义)
Thisisanimportantproblem_______toofewsocialscientistshaveresearched.
Werefertothelimitedrangeofsoundsasthephonicmediumoflanguageandindividualsoundswithinthatrangeas______.
Childrenhaveanatural________abouttheworldaroundthem.
Iwaswritingareportlastnight;________Iwouldnothavestayeduplate.
Lyingundertheskull,thehumanbraincontainsanaverageoftenbillionnervecellscalled______.
