.Evidence obtained from observation and experiment is often used to _

44.Kevin Durant becomes the youngest player to score a(n) ______ of 30 points a game for his team ______ NBA.
A. quantity; in history B. number; on the history of
C. average; in the history of D. amount; on history
【答案】C
【解析】
【详解】考查名词辨析与介词短语。句意：杜兰特成为NBA历史上最年轻的每场均得30分的球员。quantity数量，数额；number 数字；average 平均数；amount金额，数量。根据句意，杜兰特平均每场均得30分。in the history of固定短语，意为“在……历史上”。故选C。

45.Evidence obtained from observation and experiment is often used to ______ a scientific theory.
A. confirm B. conclude C. consult D. confuse
【答案】A
【解析】
【详解】考查实义动词辨析。句意：由观察和实验得出的证据通常被用来证实科学理论。A. confirm证实；B. conclude得出结论；C. consult    咨询，请教；D. confuse使更难于理解。根据常识可知，科学理论是需要观察和实验得出的证据来证实，故选A。