免疫系统的核心细胞是（），免疫应答有（）两种方式。 发布时间：2019-11-04 14:06 │ 来源：www.tikuol.com 题型：填空题 问题： 免疫系统的核心细胞是（），免疫应答有（）两种方式。
题型：填空题 阅读理解。 根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。 Friends play an important part in our lives, and although we may take the fact of friendship for granted, we often don't clearly understand how we make friends. While we get on well with a number of people, 1 . Moreover, a great many relationships come under the general term "friendship". In all cases, two people like one another and enjoy being together, but beyond that, the degree of closeness between them and the reasons for their interest in each other change greatly. At the beginning, much depends on how people meet, and on good first impressions. As we get to know people, 2 . Although these factors are not of the greatest importance, it is more difficult to have a good relationship with people when there is a big difference in age and background. Then, 3 . Friends will stand closer together and will spend more time looking at each other than ordinary friends. Smiles and soft voices also express friendliness, and it is because they may give the wrong signals that shy people often have difficulty making friends. A friendly look with a wrong facial expression can turn into an unfriendly stare, and nervousness may be wrongly understood as unfriendliness. Some relationships are a result of argument and discussion, but it is usual for close friends to have the same ideas and beliefs, the same opinions and interests. The more closely involved people become, the more they depend on each other. And 4 . Equally, friends have to learn to make allowances for each other, to put up with annoying habits, and to accept differences in opinions. In contrast with marriage, 5 . But the support and understanding that results from shared experiences and affections does seem to create a close and lasting relationship.A. we are usually friends with only a fewB. many factors can affect friendship and relationshipC. people want to do friends favors and hate to let them downD. argument and discussion can improve personal relationshipsE. we consider things like age, race, looks, economic and social status, etc.F. we pay attention to actual behavior, facial expression, and the way a person speaksG. there are no friendship ceremonies to strengthen the relationship between two people 查看答案
题型：填空题 下面给出了一个SHELL程序，试对其行后有#(n)形式的语句进行解释，并说明程序完成的功能。 #!/bin/bash #(1) dir=$1#(2) if [ -d $dir ]#(3) then cd $dir #(4) for file in * do if [-f $file ] #(5) then cat $file #(6) echo “end of file $file” fi done else echo “bad directory name $dir” fi 查看答案