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顺-和反 -1-叔丁基 -4-氯环己烷分别与热的氢氧化钠乙醇溶液反应(E2 机理 )，哪一个较快？（ ）
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[音频]PartIListeningComprehension(20minutes)SectionADirections:Inthissectionyouwillhear10shortconversations.Attheendofeachconversation,aquestionwillbeaskedaboutwhatwassaid.Boththeconversationandthequestionwillbespokenonlyonce.Aftereachquestiontherewillbeapause.Duringthepause，youmustreadthefoursuggestedanswersmarkedA)，B)，C)andD)anddecidewhichisthebestanswer.1.A) Their parents cut back the loan.B) The woman doesn't want Frank to take another English courseC) They can't pay the rent this month.D) The woman's boss refused to give her a raise.2.A) Ask Dr. Smith to alter his decision.B) Ask Dr. Smith to call the library.C) Get the book directly from Dr. Smith.D) Get Dr. Smith's written permission.3.A) $120B) $108C) $90D) $404.A) He feels unsympathetic.B) He feels it's a pity.C) He feels it's unfair.D) He feels glad.5.A) Doing business.B) Taking pictures.C) Buying cameras.D) Making movies.6.A) Looking for an apartment.B) Looking for a job.C) Taking a suburban excursion.D) Asking the man for his opinions.7.A) She'll go to her uncle's.B) She has an appointment with her friend.C) She'll have an appointment with her friend.D) She'll have a visitor.8.A) He made a sudden turn.B) He drove the bus over a bicycle.C) He tried to avoid hitting the truck.D) He was driving too fast.9.A) He is curious.B) He is impatient.C) He is exhausted.D) He is satisfied.10.A) She didn't know how to use the new oven.B) She wanted her refrigerator to be fixed.C) There is something wrong with the oven.D) There is something wrong with the food.
下列属于心血管系统药物特点的是（ ）
心血管药物，按作用机制分类有（）
心血管药物，按药效分类为（）
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