题目内容
（请给出正确答案）
Scientists have done countless experiments to show that praise is far ______ (effective) than criticism in improving human behavior．
如果结果不匹配，请 联系老师 获取答案
更多“Scientists have done countless…”相关的问题
What was the main finding of the study？
A．The warming of the world's oceans is not a threat.
B．That not enough is being done about global warming.
C．There is a puzzling gap between the model and observations.
D．Ocean waters have warmed faster than scientists had previously thought.
B.wouldnt have done
C.mightnt have done
D.didnt have to do
A.needn't have done
B.shouldn't have done
C.must not have done
D.can not have done
A、has been done
B、will have been bone
C、will do
D、would have done
The article does not mention whether the scientists' experiments with dogs have ______.
A．benefited animals other than dogs
B．served man
C．helped other dogs
D．contributed to medical knowledge
B.has been doing
C.had done
D.would have done
A.needn't have done
B.shouldn't have done
C.must not have done
D.can not have done
A.unlikely
B.unfriendly
C.forbidden
D.vulnerable
