31. The work “enhance” is closest in meaning to ____.
(A) use
(B) improve
(C) counteract
(D) balance

27. ____ of eighteenth-century Russian settlements in Alaska are found on Kodiak Island and at Sitka. (A) For the sites (B) The sites (C) They are the sites (D) There are sites

28. ____, their small size and the thin soil make them easy prey to a hiker’s heel. (A) When alpine flowers can resist wind, cold, and snow (B) Alpine flowers can resist wind, cold, and snow (C) Alpine flowers resisting wind, cold, and snow (D) While alpine flowers can resist wind, cold, and snow

29. Other desirable qualities of concrete, the only building material that can be delivered to the job site in a pliable state, include its strength, economy, and ____. (A) the fact that it lasts a long while (B) durability (C) because it lasts a long while (D) great ability to last

30. There is new evidence to suggest that a child’s personality is ____ traumatic events. (A) developed more by everyday interactions rather than by (B) developed more by everyday interactions than by (C) developed more by everyday interactions instead by (D) being developed more by every day interactions than by

32. The word “they” in paragraph 3 refers to ___. (A) aqualities (B) fins (C) grooves (D) depressions

33. Why does the author mention that “Airplanes retract their landing gear while in flight?” (A) To show that air resistance and water resistance work differently from each other (B) To argue that some fishes are better designed than airplanes are (C) To provide evidence that airplane engineers have studied the design of fish bodies (D) To demonstrate a similarity in design between certain fishes and airplanes

34. The word “sophisticated” is closest in meaning to ____. (A) complex (B) amazing (C) creative (D) practical

35. According to paragraph 4, the long bills of marlins, sailfish, and swordfish probably help these fishes by ___. (A) increasing their ability to defend themselves (B) allowing them to change direction easily (C) increasing their ability to detect odors (D) reducing water resistance as they swim

36. Which of the following is one of the reasons that tunas are in constant motion? (A) They lack a swim bladder. (B) They need to suck in more water than other fishes do. (C) They have large muscles for breathing. (D) They cannot open their mouths unless they are in motion.

37. Which of the sentences below best expresses the essential information in this highlighted sentence? “One potential problem is that opening the mouth to breathe detracts from the streamlining of these fishes and tends to slow them down.” (A) These fishes often have a problem opening their mouths while swimming. (B) The streamlining of these fishes prevents them from slowing down. (C) The streamlining of these fishes tends to slow down their breathing. (D) Opening the mouth to breathe can reduce the speed of these fishes.