题目

Directions: For each blank in the following passage, there are fourwords or phrases marked A, B, C and D. Fill in each blank with the word orphrase that best fits the context. Mice are at their bestat night. But a new analysis suggests researchers often test the nightlycreatures during the day, which could alter results and create 1 across various studies, if they recordtime-of-day information 2. Scientists assume that waking up labmice in the daytime may twist research. Of the 200 papersexamined in the new study, more than half cither failed to report the timing ofbehavioral testing or did so若logab有意义，则“logab＜0”是“（a-1）（b-1）＜0”的A.充分不必要条件B.必要不充分条件C.充要条件D.既不充分也不不要条件