简介： ( )21. This is ______useful book. ________ book is my brother’s.
A. a, The B. an, The C. a, An D. an, A【出处：21教育名师】
( )22. Wang Yaping and Liu Yang are our _____ in China. We’re proud____ them.
A. women astronauts; of B. woman astronauts ; for
C. wo...