（2016·浙江）Scientists have advanced many theories about why human beings cry tears, none of ________has been proved.
A. whom B. which
C. what D. that
（题文）（2016·江苏）To return to the problem of water pollution, I’d like you to look at a study _________in Australia in 2012.
A. having conducted B. to be conducted
C. conducting D. conducted
Silk ______ one of the primary goods traded along the Silk Road by about 100 BC.
A. had become B. reject
C. control D. abandon
（题文）We can achieve a lot when we learn to let our differences unite, rather than __________ us.
A. divide B. reject
C. control D. abandon
（2016·浙江卷·单项填空）The study suggests that the cultures we grow up _______ influence the basic
processes by which we see world around us.
A. on B. in
C. at D. about
（题文）（2016·浙江）That young man is honest , cooperative , always there when you need his help.______, he’s reliable.
A. Or else B. In short
C. By the way D. For one thing
