同学在顾问时间问到以下这题插入句，很具代表性，分享给同学。
题目出自TPO13-2 Biological Clocks. 同学可以先做题再往下看喔！
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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.
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Look at the four squares [] that indicate where the following sentence could
be added to the passage. Where would the sentence best fit?
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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.
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(作答完再往下看)
乍看很容易想选到Ｄ，因为概念好像也很合理：“没有外在提示，生物日体内调节活动对
照太阳日就会持续偏差，像潮汐一样。”
原句后半部说 the external clock appears to dominate the internal clock. 接在Ｄ
后面好像对啊？ 概念没问题，但问题是插入到D这个位置的话，后面的句子 “This
drift has been studied extensively…” 就接不下去了。
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变成这样：
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. 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.
This drift 是什么东西？？所以不能放在D.
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所以要找到一个地方是前面也有 “the external clock appears to dominate the
internal clock.”这样概念的，而且往下接也合理的位置。
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可以看到Ｂ前面的句子：
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.
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这句话重点就是“体内时钟会跟地球绕日时间一样。”所以把原句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. 接在后面，是通顺的。而且后面的句子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. 也接得上去。
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总结：
有时候会在同一段里面看到不只一个合理通顺的位子，但也要看看往下接能不能通顺，不
能只看前面喔！
再次提醒同学插入句要做对前提是一定要看懂句意，千万不要只有看关键字选，这是投机
的方式，而且应该也会发现，这样做有时可以，有时不灵光，答题很不稳定。
同学会想说可是如果要懂句意会看不完啊？那你觉得要练习的是如何能在有限时间内看懂
句子，因而能准确答对题目，还是要练习用关键字找到答案？我相信聪明的你已经有答案
了。
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Till next time,
J2