96、rational,reasonable
rational [?r???nl] a.理性的，區(qū)別于無理性；理智的，區(qū)別于感情用事的。
The rational thing to do was to take the sick man to a doctor.
reasonable [?ri:z?n?bl] a.有道理的，公平合理的，或指人講道理的。
That man works very hard, so it is reasonable for him to ask for more money.
97、refrain,restrain, constrain
refrain [ri?frein] v.抑制，禁止，強(qiáng)調(diào)抑制一種沖動，是正式用語，為不及物動詞，后接介詞from。
Students refrain from smoking in the classroom.
restrain [ris?trein] v.抑制，約束，指通過管束阻止某事發(fā)生，是及物動詞，其習(xí)慣用法是restrainsb. (sth.) from doing。
She restrains her dog by walking him on a leash.
constrain [k?n?strein] v.強(qiáng)迫，力勸，是及物動詞。
A law constrains the government from spending more money than it takes in.
98、respectable,respectful, respective一組形近易混詞。
respectable [ris?pekt?bl] a.值得尊敬的，有好名聲的。
They are respectable people who are liked and trusted in their town.
respectful [ris?pektful] a.尊敬他人的，恭敬的。
Students and teachers should have a respectful attitude toward each other.
respective [ris?pektiv] a.單個的，分別的。
99、revolve,evolve, involve
revolve [ri?v?lv] v.旋轉(zhuǎn)，轉(zhuǎn)動。
The room began to revolve , then he fainted.
evolve [i?v?lv] v.發(fā)展，演變。
Agriculture evolved slowly over thousands of years.
involve [in?v?lv] v.需要，包含；使卷入，牽涉。
Getting a driver's license involves learning how to drive, studying the rules of the road, and taking a test.
100、sanction,sanitation
sanction [?s??k??n] n.認(rèn)可，準(zhǔn)許，批準(zhǔn)。
I need my parents' sanction to stay out late.
sanitation [?s?ni?tei??n] n.公共衛(wèi)生，環(huán)境衛(wèi)生，衛(wèi)生設(shè)備。
Strict sanitation is used in businesses such as barber
shops and restaurants.
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