怀孕中后期，许多准妈妈都会有肌肉痉挛，小腿抽筋以及手足抽搐等缺钙的症状，但这通常不是由于孕妇的饮食中缺乏钙，而是由于胎儿骨骼形成所需要的钙完全来源于母体，使她们比其他人对钙有更多的需求。
以下哪项对评价上述结论的准确度最为重要（）
A．对日常饮食中钙量不足的一个孕妇和另一个非孕妇进行检测，并分别确定她们是否缺钙
B．对孕妇的科学食谱进行研究，以确定有利于孕妇摄入足量钙的最佳选择
C．对某个不缺钙的孕妇的日常饮食进行检测，确定其中钙的含量
D．对日常饮食中钙足量的一个孕妇和一个非孕妇进行检测，并分别确定她们是否缺钙
参考答案：D
解析：
题干中已经说明孕妇容易缺钙并不是因为她的日常饮食中缺钙，而是由于胎儿生长的需要使得孕妇比普通人对钙的需求量更大。A项的前提条件与题干所述方向相反，是在孕妇饮食中钙量摄入不足的假设条件下，因此排除。B项的内容不在题干讨论范围内。C项则没有比较对象。故选D。
根据短文内容，从下框的A--F 选项中选出能概括每一段主题的最佳选项，选项中有一项为多余项。
小题2:Some children have always complained that their parents are out of touch with modern ways; that they do not trust their children to deal with crises; that they talk too much about certain problems and that they have no sense of humor, at least in parent-child relationships. Actually, this happens as a result of misunderstanding because loving the young is the nature of all the parents. 小题3:Young people often get their parents annoyed with their choices in clothes and hairstyles, in idols （偶像）and music, but that is not their desire. They feel cut off from the adult world into which they have not yet been accepted. So they create a culture and society of their own. Then, if it turns out that their music or idols or clothes or hairstyles annoy their parents, this gives them additional enjoyment. They may think that they are leaders in style and taste. 小题4:Sometimes you are satisfied if your parents don’t approve of what you do. You may think that they do so for your sake. They tend to bring their children under control just because they want to be responsible for their children. On the contrary, you’ll be sad if they let you do everything in your own way. That will make you think they don’t care about you. 小题5:If you plan to control your life, you are supposed to communicate with others in a more effective way. You can charm others, especially your parents, into doing things the way you want. You can impress others with your sense of responsibility, so that they will give you the authority to do what you want to do. |