–Have you finished cleaning all the tables __...

–Have you finished cleaning all the tables ______ ?

–Yes, I have _____ cleaned them.

A.yet; yet　 　　 B. yet; already　　　　 C. already; already.

九年级英语单项填空中等难度题查看答案及解析

--Have you finished all of the exercises?---Yes, ________is left.

A.None 　　 B. Nothing

C. No one　 D. Neither.

九年级英语单项填空简单题查看答案及解析

—Have you cleaned the room yet？

—Yes，I _______it an hour ago.

A.clean　　　　　　　　 B.has cleand　　　　　　　 C.cleaned

九年级英语单项填空中等难度题查看答案及解析

---Could you please clean the house?

---　　　 ,I have to catch the early bus.

A.Yes,sure.　　 　　　　　　　　　 B.Why not?

C.I’m sorry to hear that.　　 D.Sorry,I can’t.

九年级英语单项填空简单题查看答案及解析

—Must I finish the book today?

—Yes, you ________, but you ________ finish it now. Have a rest.

A．do; don’t have to                      B．do; mustn’t

C．must; don’t have to                    D．must; mustn’t

九年级英语单项填空中等难度题查看答案及解析

All the time you spent memorizing multiplication tables（乘法表）may have made you a better mathematician, according to a new study． A team of scientists from Stanford University, in California, have shown how the brain reorganizes itself as kids learn math．

After a certain amount of time spent practicing math, kids can put away the calculator（计算器）． They don’t even need to count on their fingers． They simply know the answers to subtraction(−), addition (+), and multiplication (×) facts． The quicker kids can recall basic math facts, the easier it is for them to solve more difficult math problems．

The Stanford University researchers observed（观察）the brain activity of 28 students, ages 7 to 9, for the study． They took scans of the students’ brains as the students solved math calculations without the help of a calculator, pen or paper． A calculation—three plus four equals seven, for example—flashed on a screen． The students pushed a button to say if the answer was right or wrong． The scientists also recorded the response speed, and what parts of the brain became active as the kids pushed the button．

These observations showed a process called fact retrieval． Rather than using their fingers to count, or scrawling out equations（列算式）on a piece of paper, the students pulled the answers from memory． It’s as if the answers to basic subtraction, addition, and multiplication problems are kept in a long-term storage part in the brain． The storage part was built from repetition． “Experience really does matter,” said Dr． Kathy Mann Koepeke of the National Institutes of Health．

Children make the changefrom counting to fact retrieval when they are 8 to 9 years old, the study says． This is the time when most students are learning basic addition and subtraction． When kids have basic math facts memorized, the brain has more free space to learn more difficult math．

This process has benefits for the future． The study showed, as kids got older, their answers relied more on memory and became quicker and more correct． Less brain activity was involved in counting． Some children make this change quicker than others．

Scientists hope to use this research to develop new strategies（策略）to help kids learn math at all levels． One strategy the study suggests is for students to test themselves in different orders—solving five times three before five times two, for example． Mixing up the order keeps the brain active． Keep these trainings up, and you may be a math whiz in no time．

1.In the study, kids put away calculators because they can ______．

A．use calculators well

B．scrawl out equations

C．recalling basic math facts

D．count on their fingers

2.The process of “fact retrieval”in Paragraph 4probably means ______．

A．picking out results by working together with their partners

B．finding out answers based on practicing carefully and patiently

C．trying out ways of dealing with problems by attending training

D．working out problems according to what they have remembered

3.What can we know from the study?

A．Kids need to practice using calculators to keep their brains active．

B．Math learners should change to counting practice at the age of 8 to 9．

C．Training by mixing up the order of multiplication tables can help learn math better．

D．Less brain activity may be involved in solving difficult problems when kids get older．

4.What is the best title of the passage?

A．Math from Memory

B．Strategy Development

C．Brain Reorganization

D．Training by Repetition

九年级英语阅读理解中等难度题查看答案及解析

All the time you spent memorizing multiplication tables（乘法表）may have made you a better mathematician, according to a new study. A team of scientists from Stanford University, in California, have shown how the brain reorganizes itself as kids learn math.

After a certain amount of time spent practicing math, kids can put away the calculator（计算器）. They don’t even need to count on their fingers. They simply know the answers to subtraction(−), addition (+), and multiplication (×) facts. The quicker kids can recall basic math facts, the easier it is for them to solve more difficult math problems.

The Stanford University researchers observed（观察）the brain activity of 28 students, ages 7 to 9, for the study. They took scans of the students’ brains as the students solved math calculations without the help of a calculator, pen or paper. A calculation—three plus four equals seven, for example—flashed on a screen. The students pushed a button to say if the answer was right or wrong. The scientists also recorded the response speed, and what parts of the brain became active as the kids pushed the button.

These observations showed a process called fact retrieval. Rather than using their fingers to count, or scrawling out equations（列算式）on a piece of paper, the students pulled the answers from memory. It’s as if the answers to basic subtraction, addition, and multiplication problems are kept in a long-term storage part in the brain. The storage part was built from repetition. “Experience really does matter,” said Dr. Kathy Mann Koepeke of the National Institutes of Health.

Children make the changefrom counting to fact retrieval when they are 8 to 9 years old, the study says. This is the time when most students are learning basic addition and subtraction. When kids have basic math facts memorized, the brain has more free space to learn more difficult math.

This process has benefits for the future. The study showed, as kids got older, their answers relied more on memory and became quicker and more correct. Less brain activity was involved in counting. Some children make this change quicker than others.

Scientists hope to use this research to develop new strategies（策略）to help kids learn math at all levels. One strategy the study suggests is for students to test themselves in different orders—solving five times three before five times two, for example. Mixing up the order keeps the brain active. Keep these trainings up, and you may be a math whiz in no time.

1. In the study, kids put away calculators because they can ______.

A. use calculators well

B. scrawl out equations

C. recalling basic math facts

D. count on their fingers

2.The process of “fact retrieval”in Paragraph 4probably means ______.

A. picking out results by working together with their partners

B. finding out answers based on practicing carefully and patiently

C. trying out ways of dealing with problems by attending training

D. working out problems according to what they have remembered

3.What can we know from the study?

A. Kids need to practice using calculators to keep their brains active.

B. Math learners should change to counting practice at the age of 8 to 9.

C. Training by mixing up the order of multiplication tables can help learn math better.

D. Less brain activity may be involved in solving difficult problems when kids get older.

4.What is the best title of the passage?

A. Math from Memory　　　　 B. Strategy Development

C. Brain Reorganization　　 D. Training by Repetition

九年级英语阅读理解中等难度题查看答案及解析

Dear graduates，

It's time to say goodbye to you all. I am sure all of you have finished what the teachers want you to learn and are ready to start your new life. ______ you want to be a senior high school student or not, I believe what you've learned will be the most unforgettable ______ not only for you but also for me.

As one of the teachers in Grade Nine, I am so ______ and satisfied to keep company with you these years and to watch each of you grow day by day. Every corner in our campus(校园) is ______ with our sweet memories. Every student who entered some competitions always tried his best to ______ the prize for his own class. They practiced again and again even if they got hurt, and they never gave up ______. I hope all of you can take the spirit wherever you are. ______ your dream until you reach the goal.

Besides, use your time well. As everyone knows, “Time and tide wait for no man.” Some things will repeat ______， but others won't. So use every minute well to do some helpful and meaningful things. Don't just fool around all day and then complain, “If I had ______ time, I would do my best to finish that.” Use your time well, and you can be a very successful person in the future.

At last, all I want to tell you is facing every challenge bravely when you are ______ your way to success.

Congratulations!

1.A. Before　　 B. Until　　 C. Whether

2.A. memories　　 B. stories　　 C. people

3.A. sad　　 B. proud　　 C. nervous

4.A. remembered　　 B. cleaned　　 C. filled

5.A. win　　 B. make　　 C. beat

6.A. excitedly　　 B. happily　　 C. easily

7.A. Stick to　　 B. Thanks to　　 C. Look forward to

8.A. ourselves　　 B. yourselves　　 C. themselves

9.A. no　　 B. little　　 C. enough

10.A. by　　 B. on　　 C. in

九年级英语完型填空中等难度题查看答案及解析

--Tom, have you ever read the book《A Tale of Two Cities》　　 by Charles Dickens ?

--Yes ,I finished reading it last winter vocation．

A. wrote　　 B. to write　　 C. writing　　 D. written

九年级英语单选题困难题查看答案及解析

— Mom, must I clean my room now?

— ________. You can clean it after finishing your homework.

A.Yes, you must B.No, you can't C.No, you needn't D.Yes, I don't have to

九年级英语单选题困难题查看答案及解析