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阅读下面的说明，回答问题1～问题4，将解答填入答题纸对应的解答栏内。 [说明] 某企业使用IIS建立了一个FTP服务器，用于单位内部文件共享，下图是IIS中“默认FTP站点属性”的配置对话框。 FTP使用两条TCP连接来完成文件传输，一条连接用于传送控制信息(命令和响应)，另一条连接用于数据发送。在默认情况下，在服务器一端的控制连接使用的端口号是 (1) ，数据连接使用的端口号为 (2) 。

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Ocean transportation is widely used because it is a relatively low-cost way to transport goods, and it can easily handle large shipments（）

A. 人们在宽阔的海面上运输货物，因为它价格低并且运货量大。
B. 海洋运输被广泛使用，因为很容易用大船运送较为低廉的商品。
C. 人们广泛使用海洋运输，因为它运费较低而运量较大。
D. 海洋运输被广泛使用，因为它运量大，并且容易航行。

(四) [背景资料] 某工程位于某市中立交桥与体育场路口交叉处，总建筑面积4万多平方米，其中一号楼、二号楼和三号楼均为高层建筑。该屋面上有各种管道和屋顶花园设施等，针对该工程的使用功能和对防水、隔热要求高、难度大的特点，建设单位设计部门对防水保温隔热方案的设计和施工十分重视，经过实地考察并分析具体情况，通过精心施工，克服了各种困难，于1998年12月22日一起与其他项目验收为省优良工程，得到各方面的好评。本例采用卷材防水，你能大概判断出它的屋顶类型吗试回答并简述原因。

There is an old saying in English: "Laughter is the best medicine". Until recently, few people took the saying very seriously. Now, however, doctors have begun to investigate laughter and the effects it has on the human body. They have found evidence that laughter really can improve people’s health.Tests were carried out to study the effects of laughter on the body. People watched funny films, while doctors checked their heart rate, blood pressure, breathing and muscles. It was found that laughter has similar effects to physical exercise. It increases blood pressure, the heart rate and the rate of breathing; it also works several groups of muscles in the face, the stomach, and even the feet. If laughter exercises the body, it must be beneficial.Other tests have shown that laughter appears to be capable of reducing the effect of pain on the body.There is also some evidence to suggest that laughter helps the body’s immune system, that is, the system which fights infection.As a result of these discoveries, some doctors and psychiatrists (精神病学家)in the United States now hold laughter clinics, in which they try to improve their patients’ condition by encouraging them to laugh.1) Laughter really can (46) .2) In the first test, it was found that laughter has similar effects to (47) .3) Other tests have shown that laughter can reduce the effect of (48) on the body.4) There is evidence to show that laughter helps the body’s (49) .5) In the clinics, the psychiatrists try to improve their patients’ condition by encouraging them (50) . 46（）

阅读以下说明和关系表，回答问题1-6。[说明] 设有三个关系学生S(学号，姓名，性别，年龄，籍贯) 课程C(课程号，课程名，任课老师，所用教材) 学生成绩SC(学号，课程号，得分) 其中规定各属性定义如下：学号：SNUM 姓名：SNAME 性别：SEX 年龄：AGE 籍贯：NATIVE 课程号：CNUM 课程名：CNAME 任课老师：TEACHER 所用教材：BOOK 得分：GRADE 试用关系代数表达式表示下列查询语句。 [问题3] 检索全部学生都选修的课程号。