Theothertimingsystembelongsinourinternalclocks，which，left________，wouldtiethebodytoa25-hourrhythm.
B
译文：更不用说，另一个定时系统在我们的人体时钟内，它会使人保持在一个 25 小时的生理节奏上。此题考查关于 leave 的短语。 leave behind意为“留下， 放弃”，leave alone 意为“更不用说” 。 leave out 意为“遗漏，忽视”。
If you are walking away from a clock tower ，you will hear the ticking of the clock fade to a point ________ it cannot be heard.
The engineer ______ my father works is about 50 years old.
Modern English words man, woman, child, eat, fight, etc, originate from ______.
Hesaidthatthegroup________himaletterandaskedhimtogothereforaninterview.
Thisisanimportantproblem_______toofewsocialscientistshaveresearched.