第一篇
题目来源《Time 》— 《Why Teaching someone else is the best way to learn? 》
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46.A. Seneca's thinking is still applicable today
解析：
问题：What are researchers rediscovering through their studies?
问题题干中的“researchers”和“today”是解题的关键，对应到文中第一段的“Now scientists are bringing this ancient wisdom up-to-date”。选项中“Seneca’s thinking “ 对应到“this ancient wisdom” ，而“still applicable”对应到“bring…up-to-date”,故答案为A
 
47.B. It is a teaching tool under development
解析：
问题：What do we learn about “Betty’s Brain”
根据“Betty’s Brian”定位，定位到第三段，而该段的段首便强调“ But the most cutting-edge tool under development is the “teaching agent” “ ,意味着整段文字要叙述的主要是和“ tool “有关的信息，且选项中的”under development”和原文信息重合，故答案为B
 
48 C. It helps them learn their academic subjects better.
解析：
问题：How does teaching others benefit student tutors?
 根据顺序原则，定位区间在第三段中后部分。第三段最后两句话中“ While prepare to teach” ，“explain the information to others” 对应到“teaching others”,而“ organize their knowledge and improve their own understanding” 以及“identify problems in their own thinking ”则对应到选项中的“ learn their academic subjects better” .故答案为C
 
49 D. They use various ways to explain the materials.
解析：
问题：Whatdo students do to teach their teachable agents?
解析：根据顺序原则，定位到第四段。第四段中“ explain the materials in different ways ”恰好与选项中“ use various ways to explain the materials” 为信息的同义改写，故答案为D
 
 
50 B. Their emotional involvement
解析：
问题：What is the key factor that eases student tutors’ learning?
解析：根据顺序原则，以及“key” 对应到最后一段的第一句话。“key”与“Above all” 为同义改写，故答案应在此句中出现。“ Facilitate learning ” 对应到题干中“ eases student tutors’ learning”, 而“the emotions one experiences”则对应到选项的“Their emotional involvement”。故答案为B