问题
填空题
比较大小：6x______x2+9．（填“＞”、“＜”、“≥”、“≤”）
答案
∵（x2+9）-6x=x2-6x+9=（x-3）2≥0，
∴6x≤x2+9．
故答案为：≤
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比较大小：6x______x2+9．（填“＞”、“＜”、“≥”、“≤”）
∵（x2+9）-6x=x2-6x+9=（x-3）2≥0，
∴6x≤x2+9．
故答案为：≤
| 阅读理解。 |
| The aim (目的) of students who came to school is to study. But to study requires (需要) a right way, or you waste either the time or the money. The following are the ways of studying. The best time for reading is morning, because in the morning, the air is fresh and the mind is clear. For that reason, we can get good result. In studying we must have patience (耐心). If we have not known a text well, we must read it again. We should not read the next one till we have learned the first one. When we are studying, we must put our hearts into the book, or we can get nothing from the book while we are reading. We must always ask "whys". If it is not well understood, write it down and ask our teachers or our parents, or friends. In any possible way, we must know it completely and what we've learned can be used well and made better. Though there are many ways for studying, yet the above mentioned (提到的) will be quite enough if we can keep them in heart and do so. |
| 1. The passage tells us ______. |
[ ] |
| A. the importance of reading B. to read in the morning C. to pay attention to the ways of studying D. to have patience in studying |
| 2. The passage has taught us ______ ways for studying. |
[ ] |
| A. three B. four C. five D. many |
| 3. We'd better read in the morning because ______. |
[ ] |
| A. it's hard to remember what we have learned B. the air is fresh and the mind is clear C. it's difficult to get good results D. we have more time |
| 4. If we can't put our hearts into the book when we read, it is ______. |
[ ] |
| A. easy to understand it well B. better to get something from it C. impossible for us to get much from it D. possible to learn much from it |
| 5. In studying we must always ask "whys" in order to ______. |
[ ] |
| A. understand the book well B. write down the questions C. remember the new words D. get some questions to ask our teachers |