29. The phrase stumbled on in paragraph 5 is closest in meaning to
(A) discovered by chance
(B) was slowed down by
(C) worked on
(D) passed by

25. (A) because (B) due to (C) account for (D) owing to

26. (A) how easy (B) how easy is it (C) how it is easy (D) how easy it is

27. (A) in (B) as (C) on (D) with.

28. The author indicates that Curiosity isn't looking for life itself because (A) it can't travel to Mount Sharp, where evidence of life is most likely to be found (B) the rapid temperature changes on Mars makes it impossible (C) the surface of Mars isn't hospitable to life anymore (D) the equipment Curiosity uses isn't advanced enough

30. The first rock that Curiosity examined did NOT indicate that (A) Mars once had liquid water on its surface (B) the rock contained possible sources of energy (C) microorganisms inhabited the pond where the rock formed (D) the rock contained the basic building blocks of living organisms

31. The author mentions the photographers William Henry Jackson and Ansel Adams in part because (A) The landscapes that they photographed resembled the ones that Curiosity photographed. (B) Their photos, like the ones taken by Curiosity, captured the public's imagination. (C) Like Curiosity, they employed the most advanced photographic technology available. (D) Their images inspired the engineers and scientists who designed and built Curiosity.

32. In the concluding paragraph of the article, the author (A) describes the difficulties of Curiosity's trip to Mount Sharp (B) summarizes his feelings about Curiosity's photos (C) refers back to the introductory paragraph (D) urges the reader to learn more about Mars 

33. According to the article and line graph, which field probably has the lowest percentage of women today? (A) biology (B) physics (C) computer science (D) engineering

34. According to the article, which of these factors does NOT contribute to the low numbers of women in the STEM fields? (A) Many women take time off from work to raise a family. (B) Women who work in these fields are sometimes harassed by co-workers. (C) Young girls are often directed toward non-scientific or non-technical careers. (D) There is a systematic institutional bias against the hiring of women in these fields.

35. According to the line graph, in which field did women's participation grow the most? (A) life and physical sciences (B) the social sciences (C) engineering (D) computer-related fields