Medical researchers want to learn more about the sharks body defense and immune _____62 against disease. Researchers know that sharks _____63 quickly from injuries. They study the shark in hopes of finding a way to fight human disease.
Sharks are important for the worlds _____64 。 They eat injured and diseased fish. Their hunting activities mean that the numbers of other fish in ocean waters do not become too _____65 This protects the plants and other forms of life that exist in the oceans.
练习:
51. A attack B meet C love D visit
52. A terrible B eatable C valuable D possible
53. A source B existence C friends D fish
54. A Space B Sky C Land D Earth
55. A because B since C because of D by reason that
56. A whose B which C that D where
57. A to B for C like D with
58. A times B places C seas D oceans
59. A sciences B mathematics C chemicals D physics
60. A feelings B senses C touches D tastes
61. A those B these C another D other
62. A systems B processes C ideas D circles
63. A recover B reform C return D rely
64. A rivers B oceans C forests D mountains
65. A weak B little C few D great
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