It was not until 1920 ______ regular radio broadcast began.
A) while B) which C) that D) since
—Cars moved very slowly in the 1920's.—Yes, but they ______ move more quickly than 1910.
A.were to
B.did
C.will
D.can
A.boogie-woogie
B.ragtime
C.folk music
( )(1845~1920)将全世界已发表的真菌描述进行了收集整理,用拉丁文汇编成26卷的巨著《真菌汇刊》。