试题与答案

Passage TwoWhat is Larsen ice shelf a. T

题型:单项选择题

题目:

Passage Two

What is Larsen ice shelf a. The coldest part of Antarctica. b. The most fragile part of Antarctica. c. The closest part of Antarctica to Australia. d. The part of Antarctic where most scientists live.

答案:

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参考答案:D解析:避孕套阻止精卵相结合而达到避孕,又能预防性传播疾病。口服避孕药主要抑制排卵,改变宫颈粘液及子宫内膜功能。宫内节育器多种途径改变子宫内膜内环境,或刺激输卵管蠕动等,干扰精子生存、受精...

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