TOP閱讀 Biological clocks插句題 - 英檢

※ 引述《FenderST54 (Fender)》之銘言：
: 答案為B 但我覺得B選起來有點突兀
: 我的想法是
: A不能選 因為後面有such an
: D不能選 drift明顯是連句
: C看起來可以 因為後面接著提到external相關 至於為什麼答案要B我就不知道了
: 懇請解答 謝謝!
: Paragraph 3：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. ■Yet despite
: this synchronization of the period of the internal cycle, the animal's timer
: itself continues to have its own genetically built-in period close to, but
: different from, 24 hours. ■Without the external cue, the difference
: accumulates and so the internally regulated activities of the biological day
: drift continuously, like the tides, in relation to the solar day. ■This
: drift has been studied extensively in many animals and in biological
: activities ranging from the hatching of fruit fly eggs to wheel running by
: squirrels. Light has a predominating influence in setting the clock. Even a
: fifteen-minute burst of light in otherwise sustained darkness can reset an
: animal's circadian rhythm. Normally, internal rhythms are kept in step by
: regular environmental cycles. For instance, if a homing pigeon is to navigate
: with its Sun compass, its clock must be properly set by cues provided by the
: daylight/darkness cycle.
: 13. Look at the four squares [■] that indicate where the following sentence
: could be added to the passage.
: Because the internal signals that regulate waking and going to sleep tend to
: align themselves with these external cues, the external clock appears to
: dominate the internal clock.
插入據討論兩個項目的關係
應該是前面出現過兩個項目的敘述
: Where would the sentence best fit?

整個文章的轉折點是這一句
Yet despite this synchronization of the period of
the internal cycle, the animal's timer
itself continues to have its own genetically built-in period close to

插入句本身有指示詞these external cues
A 顯然不合 因為後面是 Such an external

插入B之後 才會讓this synchronization
可以指到前方的 align themselves with these external cues
這兩者的意義是相同的

所以插入句讓文章的文法變的完整
........................................
另外轉折句有個特性可以當作插入的指標
轉折句的前半despite this synchronization of the period of
the internal cycle 對應的是前一句

後半會對應後一句之後的內容
.......................................
文章是說
external cue
1. coordinates an animal's daily rhythms with local solar day
2.to keep the internal clock's period close to that of Earth's rotation.

因為E調整I 所以 看起來E是主導

不過由於生物本身有built-in period close to, but different from, 24 hours
(不是24小時為週期的律動)
所以累積後產生drift

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