研究对象在回忆的准确性或完整性上的不同而产生的偏倚是
A．无应答偏倚B．混杂偏倚C．报告偏倚D．回忆偏倚E．易感性偏倚
参考答案：D
什么是著作权人？
根据下列句子及所给汉语注释，写出空缺处各单词的正确形式，每空只写一词。
小题1:His life became much more difficult after his father’s ________(死).
小题2:Is he able to __________(提供)us with some useful information.
小题3:After having a picnic, all of us felt tired and_________(困倦的)
小题4:Sun Yang was on world record pace in the ________(最终的) 50 meters and broke the Olympic record.
小题5:Two________（渔民）died in the river yesterday.
