单项选择题
A.stand up B.stand by C.stand for D.stand out
Scientists say it may be five or six years () this medi...
单项选择题Scientists say it may be five or six years () this medicine is tested on human beings.
A.since B.before C.after D.when
() the obvious differences in size and population, the ...
单项选择题() the obvious differences in size and population, the states of America have many things () common.()
A.Although; on B.Though; in C.Despite; in D.Because of; on
A club is a place to make frequent() with friends. A.ac...
单项选择题A club is a place to make frequent() with friends.
A.accounts B.attempts C.contents D.contacts