During rush hours, the subway is always ____(太拥挤了以至于不能)get in. (too)
微量元素在人体内的质量总和不到人体质量的千分之一,但这些元素对人体的正常发育和健康起着重要作用。下列各元素全部属于人体中微量元素的是()
When she knew her son was out of danger, she was relaxed.