50. What did the voyages of HMS Challenger (line 13) and The Pram (line 26) have
(A) Both provided new scientific data about the Gulf Stream.
(B) Both disproved previously accepted scientific beliefs.
(C) Both voyages took place at the same time.
(D) Both voyages produced maps of the seabed.

46. According to the passage, which of the following is true of the discoveries of the HMS Challenger? (A) They Jed zoologists to argue that there were no 300 fathoms (B) They confirmed theories about (C) They provided no new information about the seabed (D) They revealed an important new mineral source 

47. The word "they" in line 22 refers to (A) routes (B) oceanographere (C) winds (D) currents

48. According to the passage, which of the following is true about Matthew F. Maury? (A) His ship traveled to the North Pole in 1893. (B) He believed winds to be the source of currents. (C) His studies or wind patterns enabled sailors to shorten their travel times. (D) He believed that currents flowed only from warmer regions to cooler ones.

49. The passage suggests which of the following about the visit of The Fram to the North Pole? (A) Matthew F. Maury was aboard The Fram when it traveled to the North Pole. (B) During The Pram's visit to the North Pole. Matthew F. Maury's belief about the North Pole's sea was tested. (C) The discoveries of The Pram were later refuted by Matthew F. Maury's discoveries. (D) The Pram found that the water surrounding the North Pole was ice free.

1. The passage mainly discusses the (A) development of synthetic colors foe textiles during the nineteenth century (B) advantages of chemical dyes over dyes derived from plants and animals (C) differences between dyeing textiles and printing ihem (D) history of the use of natural and chemical dyes to color textiles

2. According to the passage, what was the source of most textile dyes that were used before the nineteenth century? (A) Animals (B) Minerals (C) Plants (D) Chemicals

3. What was the advantage of using madder plants for different shades of red? (A) It was possible to cultivate madder plants in almost every location, (B) Madder plants produced brighter colors than other plant sources. (C) Plant sources produced more lasting colors than animal sources. (D) Dyes derived from the madder plants were easier to work with than other dyes-

4. The word "invariably" ID line 13 is closest in meaning to (A) without exception (B) steadily (C) after some time (D) noticeably

5. It can be inferred from the passage that the green areas in woven tapestries developed a bluish tinge because (A) a darker color, like blue, dominates a light color, like yellow (B) light changed some of the green dye used in the tapestries to blue (C) the yellow dye. that was used in the tapestries had faded (D) the dyes used to color woven tapestries were made from minerals

6. The word "superseded" in line 15 is closest in meaning to (A) strengthened (B) improved (C) replaced (D) complemented