The word "enhancement" in line 20 is closest in meaning to（）
A. replacement
B. design
C. improvement
D. decoration
What can be inferred from the passage about the difference between written and oral literature（）
A. Written literature reflects social values better than oral literature does
B. Written literature involves less interaction between audience and creator during the creative progress than oral literature does
C. Written literature usually is not based on historical events, whereas oral literature is
D. Written literature is not as highly respected as oral literature is
根据《砌筑砂浆配合比设计规程》JGJ98，用强度等级为42.5的水泥制备M15水泥砂浆，每立方米水泥砂浆的水泥用量至少是（）。
A. 280kg
B. 350kg
C. 230kg
D. 400kg
The word "compelling" in line 17 is closest in meaning to（）
A. joyous
B. intricate
C. competing
D. forceful
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