A、Learned mathematical arts.
B、Explored the natural and social world.
C、Learned specific topics.
D、sought help.
A、Used essential tools of inquiry
B、Learned mathematical arts only
C、sought help
D、Learned general topics.
A、quit
B、drop out
C、give up
D、check out
A、inter-
B、over-
C、anti-
D、out-
A、High school students
B、middle school students
C、college students
D、postgraduate students
A、Britain
B、Canada
C、America
D、German