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问题 单项选择题

避孕中控制生殖过程的关键环节为（）

A、抑制精子与卵子产生

B、阻止精子与卵子结合

C、使子宫环境不利于精子获能、生存，或不适宜受精卵着床和发育

D、以上都是

答案

参考答案：D

单项选择题

Keith Keeley, an associate at Friedman, Harris, and Levinsky LLC, was requested by a Managing Director of the firm to help construct the consumer price index (CPI). Keeley sought to determine which goods and services to include in the index by observing what a typical U. S. household purchases. He then took a large survey of individuals to determine what percentage of their disposable income they spend on each of the items and used these percentages as the weights for the major categories in the CPI. The steps that Keeley undertook are all part of which stage in constructing the CPI index（）

A. Select the CPI basket.

B. Calculate the CPI.

C. Conduct the monthly price survey.
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问答题 简答题

界面的两个基本特征
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