题目内容
The number of integer solutions for the syetem of inequalities 
about x is just 6，then the range of value for real number a is
（integersolutions整数解；syetem of inequalities不等式组；the range of value取值范围）
- A.-2.5＜a≤-2
- B.-2.5≤a≤-2
- C.-5＜a≤-4
- D.-5≤a≤-4
A
分析：根据不等式的性质求出不等式的解集，根据不等式的解集找出不等式组的解集，根据已知得到-5＜2a≤-4，求出即可．
解答：
，
解①得：x≥2a，
解②得：x＜2，
∴不等式组的解集是2a≤x＜2，
∵不等式组的整数解有6个，
∴-5＜2a≤-4，
∴-2.5＜a≤-2．
故选A．
点评：本题考查了解一元一次不等式（组）的应用，能求出关于a的不等式-5＜2a≤-4是解此题的关键．
分析：根据不等式的性质求出不等式的解集，根据不等式的解集找出不等式组的解集，根据已知得到-5＜2a≤-4，求出即可．
解答：
，解①得：x≥2a，
解②得：x＜2，
∴不等式组的解集是2a≤x＜2，
∵不等式组的整数解有6个，
∴-5＜2a≤-4，
∴-2.5＜a≤-2．
故选A．
点评：本题考查了解一元一次不等式（组）的应用，能求出关于a的不等式-5＜2a≤-4是解此题的关键．
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相关题目
The number of integer solutions for the syetem of inequalities
about x is just 6，then the range of value for real number a is（ ）
（integersolutions整数解；syetem of inequalities不等式组；the range of value取值范围）
|
（integersolutions整数解；syetem of inequalities不等式组；the range of value取值范围）
| A、-2.5＜a≤-2 |
| B、-2.5≤a≤-2 |
| C、-5＜a≤-4 |
| D、-5≤a≤-4 |
US college students are burdened, with credit card (信用卡)debt, according to a study published Tuesday, and the problem can be serious－ranging from more drop-outs, to future employment problems and even self-murder. The study, by Georgetown University sociologist (社会学家) Robert Manning, blamed credit card issuers for actively targeting students and colleges for allowing them to do so. "The unrestricted selling of credit cards in universities or colleges is so aggressive that it now forms a greater threat than alcohol or sexual diseases," Manning told a news conference in Washington. "If we do not quickly deal with this serious problem, the matter will continue to get worse, with social consequences far more tragic (悲剧的) than mere dollars and cents. "
Based on hundreds of face-to-face interviews and surveys with students, Manning concluded both the number with credit card debt and their indebtedness had been "underreported" in previous studies－which failed to reflect the "survival strategies" many used to deal with their debts. These included the use of federal student loans to pay off credit cards, effectively shifting the debt, appealing to parents for loans, reducing course work hours to increase time at paid jobs, or even dropping out altogether to work full time.
"Official drop-out rates include growing numbers of students who are unable to cope with the stress of their debts and / or part time jobs for servicing their credit cards, " the study said. "Students credit card debts are examined during the employment process and may be an important factor in evaluating future employees," it noted. O’Donnell and Manning agreed students should bear some responsibility for reckless use of credit, but said credit card companies also had to be held responsible for making it so easy for them to get into debt. Manning said one of the most troublesome aspects of the student credit card issue was "the seduction (诱惑) of college and university officials by the credit card industry".
【小题1】Sociologist Robert Manning's study shows that .
【小题2】The author's feeling towards college students with credit card debts is __.
【小题3】The author implies all of following should be responsible for this problem EXCEPT .
【小题4】The word "reckless" in Paragraph 3 can be replaced by .
Based on hundreds of face-to-face interviews and surveys with students, Manning concluded both the number with credit card debt and their indebtedness had been "underreported" in previous studies－which failed to reflect the "survival strategies" many used to deal with their debts. These included the use of federal student loans to pay off credit cards, effectively shifting the debt, appealing to parents for loans, reducing course work hours to increase time at paid jobs, or even dropping out altogether to work full time.
"Official drop-out rates include growing numbers of students who are unable to cope with the stress of their debts and / or part time jobs for servicing their credit cards, " the study said. "Students credit card debts are examined during the employment process and may be an important factor in evaluating future employees," it noted. O’Donnell and Manning agreed students should bear some responsibility for reckless use of credit, but said credit card companies also had to be held responsible for making it so easy for them to get into debt. Manning said one of the most troublesome aspects of the student credit card issue was "the seduction (诱惑) of college and university officials by the credit card industry".
【小题1】Sociologist Robert Manning's study shows that .
| A．the number of American college students using credit cards on campus is increasing |
| B．more and more American college students meet with credit card debt problems |
| C．more and more American colleges encourage students to use credit cards to make profits |
| D．credit card issuers will run into debt for encouraging college students to use credit cards |
| A．discouraged and negative | B．pitiful and critical |
| C．indifferent and disapproving | D．negative and doubtful |
| A．credit card issuers | B．college authorities |
| C．parents of the students | D．students themselves |
| A．inconsiderate | B．frequent | C．careful | D．regular |
Now you’ve finished three years of English study. There’s one way to demonstrate(展示)what you’ve learned-take a test!
Do you have any special methods(方法) you use to help you do better on a test? How well you do is often a matter of how well prepared you are. Here are some ways to make sure you’re at your best on test days.
Go to bed early. The night before a test is not the time to stay up watching TV. You want to be rested and wide-awake for test day.
Have a good breakfast. Test day isn’t a morning for donuts(面包圈).Nor is it a time to starve yourself. Eat plenty of low-sugar, high-energy food to keep your brain and body working their best.
Be prepared, Make sure you have two pencils and anything else you were asked to bring.
Watch the numbers. Make sure that the number of the items(项目)on your answer sheet matches the number of the question.
Look over all the answer choices(选择). Don’t assume(假定)that choice A is correct until you’ve checked the others. You may find a better one. And it is wrong to eliminate(排除)any choice that you can see at once. You’ll have a better chance of finding the right answer.
Check the clock. Make sure you allow yourself enough time to answer every question and go back and check your answers .Don’t spend too much time on any difficult question .Skip(跳读)it and come back to it later.
Keep up with your school work all year long That’s how you get the skills you need for taking tests.
四、填写表格，每空一词（10分）
Do you have any special methods(方法) you use to help you do better on a test? How well you do is often a matter of how well prepared you are. Here are some ways to make sure you’re at your best on test days.
Go to bed early. The night before a test is not the time to stay up watching TV. You want to be rested and wide-awake for test day.
Have a good breakfast. Test day isn’t a morning for donuts(面包圈).Nor is it a time to starve yourself. Eat plenty of low-sugar, high-energy food to keep your brain and body working their best.
Be prepared, Make sure you have two pencils and anything else you were asked to bring.
Watch the numbers. Make sure that the number of the items(项目)on your answer sheet matches the number of the question.
Look over all the answer choices(选择). Don’t assume(假定)that choice A is correct until you’ve checked the others. You may find a better one. And it is wrong to eliminate(排除)any choice that you can see at once. You’ll have a better chance of finding the right answer.
Check the clock. Make sure you allow yourself enough time to answer every question and go back and check your answers .Don’t spend too much time on any difficult question .Skip(跳读)it and come back to it later.
Keep up with your school work all year long That’s how you get the skills you need for taking tests.
四、填写表格，每空一词（10分）
| How to make sure that you can do 1 on test days | |
| 2 | Things you do |
| Going to bed early | Not 3 up or being asleep for test day |
| Having a good breakfast | Eating 4 low-sugar, high-energy food |
| Being prepared | Remembering to 5 two pencils and the 6 things you were asked to bring |
| Watching the numbers | The number of your answer should 7 the number of the question |
| Looking over all the choices | Don’t assume that the choice A is correct 8 you’ve checked the others |
| Checking the clock | 9 your time carefully and not spending too much on any difficult question |
| You will get the skills you need 10 you keep up with your schoolwork all year long | |