题目
A have conducted
B have been conducted
C had conducted
D had been conducted
第1题
Experiments have to be made under carefully _____ conditions .
A.treated
B.supplied
C.related
D.controlled
第2题
Experiments show that daydreaming significantly__________to intellectualgrowth.
A、attributes
B、distributes
C、helps
D、contributes
第3题
第4题
A.experiment
B.experiments
C.experiences
D.experience
第5题
A.It suggests a need to discard methods used in earlier experiments
B.It tends to weaken the assumptions on which earlier experiments were designe
C.It suggests that the problem revealed in earlier experiments may be more widespread than previously thought
D.It helps to explain a phenomenon revealed in earlier experiments
第7题
Scientists have done countless experiments to show that praise is far ______ (effective) than criticism in improving human behavior.
第8题
A.is addicted to
B.is expected to
C.is committed to
D.is used to
第9题
A.When
B.While
C.Unless
D.Until
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