______ to nuclear radiation, even for a short time, may influence genes in human bodies.

(单选题)The printer ______ out of order, the secretary did not know (单选题)His coach suggested that he ______ his right hand within six (单选题)At that time she could not ______ a new dress on her income. (单选题)The United States of America has a population of over ______ (单选题)Who was the first president of the USA? (单选题)—What do you think of Xi’an?—I think it’s becoming ______. (单选题)《英语课程标准》（实验稿）对小学毕业生的英语词汇要求是______。 (单选题)《英语课程标准》（2011年版）以“______”的描述方式设定各级目标要求，旨在强调培养学生的综合语言运用能力。 (单选题)形成性评价是日常教学中由教师和学生共同参与和实施的评价活动，其首要目的是促进学生学习，核心是通过不同形式的反馈给学生提供 (单选题)《英语课程标准》中列出的英语学习的策略是认知策略、调控策略、______。