问题
Since no one really knows what effects the GM foodmight have _____ us humans, many countries think that they should be cautious_____ this new technology.
A:kept up
B:on to
C:in to
D:on with
B:on to
C:in to
D:on with
正确答案是：
同类题型
Do you think ______ story you were told just now ______ interesting one
_____ his arrival at the airport he was greeted by many teenagers holding flowers in their hands
oy the scenery, Sara would spend long hours on the train______ travel by air
______ is said, the Yeti is a large, hairy animal that walks on two feet like a human being.