His comprehensive surveys have provided the most statements of how, and on whatbasis, data are collected.
A. explicit B. ambiguous
C. original D. arbitrary
Many businesses started up by college students have thanks to the comfortable climate for business creation.
A. fallen off B. taken off
C. turned off D. left off
（2016·江苏卷﹒单项填空）Dashan, who ____________ crosstalk, the Chinese comedic tradition, for decades, wants to mix it up with the Western stand-up tradition.
A. will be learning B. is learning
C. had been learning D. has been learning
(2016·江苏)In art criticism, you must assume the artist has a secret message ________within the work.
A. to hide B. hidden
C. hiding D. being hidden
（2016·江苏卷·单项填空）If it_________ for his invitation the other day, I should not be here now.
A. had not been B. should not be
C. were not to be D. should not have been
（2016·江苏）______some people are motivated by a need for success, others are motivated by a fear of failure.
A. Because B. If
C. Unless D. While
