Section1
上期复习
Just as research helps scientists make educated guesses, the information about the problem led them to make several intelligent deductions¹ about its cause.

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Section2  本单元复习

1.The small remuneration for the work was almost like getting no money at all.
 (a) bribe      (b) pay      (c) work       (d) penalty

2. The benefits were changed to include dental insurance, more vacation days, and life insurance.
(a) rules of a factory  
(b) calendars of meetings  
(c) expenses related to work  
(d) "extras" from an employer