Animals need natural periodic signals like sunrise to maintain a cycle whose period is precisely 24 hours. ■Such an external cue not only coordinates an animal's daily rhythms with particular features of the local solar day but also—because it normally does so day after day-seems to keep the internal clock's period close to that of Earth's rotation.
11. The word it in the passage refers to
○ an external cue such as sunrise
○ the daily rhythm of an animal
○ the local solar day
○ a cycle whose period is precisely 24 hours
这道题怎么能快速选出是A呢
reference questions,由于代词是对于文中某个信息的指代,出于结构简洁的考虑、避免大量重复的考虑,首先80%前置,其次关注主格宾格,如是主格关注主语,如是宾格关注宾语。再次关注单复数。三者共用。第四种方法靠理解上下文逻辑推理,对于词汇、长难句理解、阅读速度有要求,稍难。此题中由于it的主宾格都是it,所以主要考虑前置原则和单复数,it为单数,复数形式为they、them,所以到前面找单数名词,抛弃复数名词,抛弃 rhythms 、 features ,留下external cue 、day,再觉得哪个符合because it normally does so day after day这句话。很明显external cue,通过理解也知道 sunrise和day after day符合逻辑。