练习:
) l: q- y- N! S; K4 |0 x 1 .The clock located inside our brains is similar to our bedside alarm clock because ) @" ^9 Y9 H6 c4 {. x* V" [
A it controls when we wake,when we eat and when we sleep.
* q$ \3 E1 h8 D- m B it has a cycle of 24 hours. / s4 G5 [) W& e* _+ j$ A' \& ]
C it is a cycle also called circadian rhythm. & G9 f) ]% q& J4 Z- x: ]+ O8 x7 \
D it can alarm any time during 24 hours. 8 r. l, d2 |6 K- Z9 E
2. What is implied in the second paragraph? ; F) R z! |" ? X5 S
A Young children’s biological clock has the same rhythm with that of the teenagers.
2 u" P1 w) o a B People after puberty begin to go to bed earlier due to the change of the biological clock.
# {1 |% C$ S5 o6 p) F/ Z$ F, f7 Z C Children before puberty tend to fall asleep earlier at night than adolescents. / [1 E9 k# W2 ?# s3 c. f7 c: N
D Teenagers go to bed later than they used to due to the light from the computer screen. " ~( C5 x6 K$ n8 q$ l6 J: M/ J
3. In the third paragraph the author wants to tell the reader that
, g6 ~+ A6 B; \: Z' y# a A it is natural for teenagers to stay up late and get up late.
( b" y3 _0 K6 ~ B staying up late has a bad effect on teenagers’ ability to think and learn.
/ J' E6 _3 u* s C during puberty most teenagers experience a kind of gray cloud.
8 c. z& \$ H4 O: u. p D it is hard for teenagers to get out of bed in the morning. 2 X* f( R) K; }4 f+ l
4. Which of the following statements is NOT true according to the fourth and fifth paragraphs?
/ I4 M7 d9 d1 K7 E A Our biological clock resets itself automatically.
- \4 J S$ q! H, ~2 B B light gets through our eyes and resets our biological clock.
, c3 U+ T2 k8 m6 G1 g C Our internal clock as well as the alarm clock can be reset automatically. " f9 M( w/ ^6 `8 Y" a+ L" [
D Our internal clock,like the alarm clock,can be reset. 5 V( n( W' Y: ~& _" y1 [9 e, Z1 ?7 G" i
5. According to the last two paragraphs, what did the previous researchers think about the human eye’s light-sensing system?
2 U j' Y, c! B" Q A The human eye had two light-sensing systems. www.Examw.com: U8 V/ V' ~' s B$ z6 P! w/ b% i; e
B The human eye had one light-sensing system.
( K% J, V7 B( I6 r% R- p8 y6 B3 w% i1 s C The human eye could sense the light of day more quickly than the dark of night. - ^4 B8 V# e! J* |
D The human eye could reset our internal clocks in accordance with the alarm clocks.
2 L1 n$ V9 B2 Y; i+ Y4 d9 g 答案与题解: $ \7 x T' A; F$ z8 y; r3 S
1.B 第一段第二句提供了答案。句中的your internal clock 即指a clock located inside our
" E% M& i- @+ g$ g! f2 `+ W3 F Brains。
, G) K" ^/ {# Q+ ?5 t6 c# R4 Y 2. C 第二段主要内容是告诉读者,过了青春期(puberty),由于生物钟节奏的变化,青少年(adolescents and teenagers)比以前要晚睡几小时。所以C是该段所隐含的内容。
9 S" v; j) b0 {! |; K6 z4 R 3. B 第三段的最后一句直接给出了答案。
! V. H( J9 |4 h0 J9 K 4. C 根据第四和第五段的内容,闹钟和生物钟都可以重新设定时间,但生物钟能通过眼睛接
' G, L& [' r# x. J 受的日光来自动调节生理节奏。所以A、B和D都是这两段中所述内容,C是正确选择,因为闹钟不能自动重新设定时间。
2 O1 }# y( O U5 s' y 5.B 问题使用的是过去时,问的是研究者在最新发现(recent discoveries)之前对眼睛感光系统的认识,即,the signals that synchronize the body’s clock were handled through the same 7 M; J5 t- ^4 F) x8 b
pathways that we use to see (眼睛所接受到的平衡生物钟的光信号同样作用于人类的视觉系统),也就是说,研究者之前认为人类的眼睛只有一个感光系统。但最新发现却是,人的眼睛有两个感光系统。 |