题目内容

生物种群密度增加能够引起种群内部的变化，使出生率、死亡率等种群参数变化，这种变化会受到生物的______作用的影响。

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患者，女，32岁。妊娠34周Ⅲ度胎盘早剥，行剖宫产术时见子宫表面有紫色淤斑，尤其胎盘附着处更为显著，子宫出血多。不正确的处理是

A. 输液、输血
B. 按摩子宫
C. 经积极处理子宫出血仍多应立即切除子宫
D. 立即子宫切除术
E. 子宫肌壁内注射缩宫素

In this section you will hear everything ONCE ONLY. Listen carefully and then answer the questions that follow. Mark the correct answer to each question on your answer sheet. Questions 1 to 5 are based on an interview. At the end of the interview you will be given 10 seconds to answer each of the following five questions. Now listen to the interview. If parents want to know how they spend the money, they should

A. figure out where the money goes.
B. take a piece of paper with them.
C. budget for a baby every day.
D. note down every expense.

生物群落的______结构是指生物群落的配置状况或水平格局，它包括生物群落的镶嵌性、两个以上的生物群落有规律地重复交替的结构格局、生物群落复合体和生物群落的交错区。

随着密度增加，没有领域或没有配偶的生物个体比例将增加，它们最易受不良天气和天敌的危害。如果这部分生物个体比例增加，会使生物种群的增长速率______。