Below 600 feet ocean waters range from dimly lit to completely dark.

单项选择题The doctors have abandoned the hope to rescue the old man.

单项选择题He often finds fault with my work.

单项选择题Many of novelist Carson McCullers' characters are isolated, disappointed people.

单项选择题John has made up his mind not to go to the meeting.

单项选择题In 1861 it seemed inevitable that the southern states would break away from the Union.