某厂生产白水泥，对每一窑生产的水泥都需要测定其抗压强度，以确定水泥标号，一般是将水泥做成的试块养护28天所测得的数据为准。但是水泥不可能堆放28天后再出厂，所以考虑用 7天的抗压强度x来预测28天的抗压强度y。现在统计了26窑的数据，求得如下结果：
=24.177，
=30.323，Lxx＝41.566，Lxy＝37.31，Lyy＝65.686,又假定在显著性水平0.05&查表得到相关系数的临界值为0.388，F分布的临界值为4.26。利用以上数据回答下列问题(1)～(6)：
如果求得7天的抗压强度为26，那么可以预测28天的抗压强度为（）。
A．31.96
B．37.576
C．26.738
D．32.354
参考答案：A
第二节（共8小题；每小题1分，满分8分） 阅读下面短文，根据短文内容，在表格中第63至第70小题的空格里填上适当的单词，使信息完整。每空填一个词。（注意：请将本题答案写在二卷指定位置） Maybe you think you will never be a top student. However, this is not necessarily so. Anyone can become a better student if he or she wants to. Here’s how. 1. Plan your time in a careful way. When you plan your week, you should make a list of things that you have to do. After making this list, you should make a schedule of your time. First, you time for eating, sleeping, dressing, etc. Then decide a good, regular time for studying. Don’t forget to set aside enough time for entertainment. A weekly schedule may not solve all your problems, but it will force you to realize what is happening to your time. 2. Find a good place to study. Look around the house for a good study area. Keep this space, which may be a desk or simply a corner of your room, free of everything but study materials. No games, radios, or television! When you sit down to study, concentrate on the subject. 3. Make good use of your time in class. Take advantage of(利用) class time to listen to everything the teacher says. Really listening in class means you don’t need to work as much later. Taking notes will help you remember what the teacher says. 4. Study regularly. When you get home from school, go over your notes and the important points that your teacher mentioned in class. If you know what your teacher is going to discuss the next day, read that material. This will help you understand the next class. If you do these things regularly, the material will become more meaningful, and you will remember it longer. 5. Develop a good attitude about tests. The purpose of a test is to show how much knowledge you have learned about a subject. They help you remember what you have learned. The world won’t end if you don’t pass a test, so don’t be overly worried. There are other methods that might help you with your studying. You will probably discover many others after you have tried these. (63) ___________ to be a top student
| ||||||||||||||||||||