历届高考完形填空语篇荟萃(28)

(二十八)

At the beginning of this century, medical scientists made an interesting discovery: we are built not just of flesh（肌肉）and blood but also of time. They were able to show that we all have a 'body clock' inside us, which controls the rise and fall of our body energies, making us different from one day to the next.
The idea of a 'body clock' should not be too surprising since the lives of most living things are controlled by the 24-hour night -and-day cycle（循环）. We feel tired and fall asleep at night and become lively and energetic¹ during the day. If the 24-hour cycle is disturbed most people experience unpleasant² feelings. For example, people are not used to working at night can find that lack of sleep causes them to perform badly at work.
As well as the daily cycle of sleeping and waking, we also have other cycles which last longer that one day. Most of us would agree that we feel good on some days and not so good on others; sometimes our ideas seem to flow and at other times, they just do not exist. [NMET2000]
简析：说明文文体，阐述生物钟对我们的影响。

1 energetic   

adj.充满活力的，精力充沛的

参考例句：

• The elderly man is quite energetic.这位上了年纪的老人仍精力充沛。
• Her mother was a resourceful and energetic woman.她母亲是一个足智多谋、精力充沛的女人。

2 unpleasant   

adj.使人不愉快的，使人厌恶的，煞风景的

参考例句：

• A very unpleasant thing has happened.一件令人很不愉快的事发生了。
• The kind advices are often unpleasant to the ear.好言常常不入耳。