英语题 我很头痛

英语题 我很头痛
Earth’s animals are disappearing faster than they reproduce. Because there is too ___41____ research and too much ignorance, ____42____ is aware of how much we are losing.
Many different kinds of plants and animals ____43____ extinct. Every year 0.5 percent of the ____44____ things in the tropical rain forests become extinct. Some disappear ____45____ they are found and named. No one has time ___46____ them before they are gone.
The disappearance of species ____47____ scientists. They want the U.S. Endangered Species Act of 1973 to be made ____48____.This act was formed to protect endangered species. ____49___, land developers and factory owners disagree. They want changes that will make the act weaker. They think the act is not working. They believe it is not ___50____ to private landowners. They want the act to consider people more.
41. A. little B. a littleC. few D. a few
42. A. anyone B. no one C. someone D. either one
43. A. are becomingB. were becoming C. becameD. to become
44. A. livelyB. aliveC. living D. live
45. A. as B. afterC. untilD. before
46. A. studyB. to studyC. studyingD. studied
47. A. interestsB. attractsC. worriesD. encourages
48. A. betterB. largerC. fasterD. stronger
49. A. HoweverB. FurthermoreC. ThereforeD. Though
50. A. enoughB. fairC. importantD. effective