课时作业(十五) ⅰ. 单项填空 1. 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 考查动词辨析。句意：由观察和实验所获得的证据经常被用来确认一项科学理论。confirm“确认”；conclude“结论；推断”；consult“咨询”；confuse“迷惑”。根据句意可知，a项正确。 2. “don’t play football in the teaching building,” said the headmaster. the headmaster told us ________ football in the teaching building. a. to not play b. not to play c. not playing d. not played 答案 b 解析 tell sb. not to do sth. “叫某人不要做某事”。
