网友您好， 请在下方输入框内输入要搜索的题目：
题目内容
（请给出正确答案）
单选题
Seven years ago, Scott was 3 times as old as Kathy was at that time. If Scott is now 5 years older than Kathy, how old is Scott ?
A
12.5
B
13
C
14
D
14.5
参考答案
参考解析
解析：
这是一道稍复杂的计算题，设Scott七年前的年龄为X，则有X+7-（1/3X+7）=5，由此可得X=7 1/2，再加上7即是Scott现在的年龄，因此该选14.5。
这是一道稍复杂的计算题，设Scott七年前的年龄为X，则有X+7-（1/3X+7）=5，由此可得X=7 1/2，再加上7即是Scott现在的年龄，因此该选14.5。
更多 “单选题Seven years ago, Scott was 3 times as old as Kathy was at that time. If Scott is now 5 years older than Kathy, how old is Scott ?A 12.5B 13C 14D 14.5” 相关考题
考题
When did the children begin to speak English?A. When they are 5 years old. B. When they are 6 years old.C. When they are 7 years old. D. When they are 8 years old.
考题
28． How old is John's brother now when John is fifteen in the story?A．Ten years old．B． Fifteen years oldC． Twenty years oldD． Twenty-five years old．
考题
We can infer from Dr. Myers and Dr. Worm’s paper that ________.[A] the stock of large predators in some old fisheries has reduced by 90%[B] there are only half as many fisheries as there were 15 years ago[C] the catch sizes in new fisheries are only 20% of the original amount[D] the number of larger predators dropped faster in new fisheries than in the old
考题
What is known about the influenza virus?A. It was first found in a group of very old birds.B. All the different strains can be found in wild birds.C. It existed over 100 million years ago.D. It can survive in many different places.
考题
There used to be an old city here, which was ()under the river about 2000 years ago.A、insultedB、insulatedC、buriedD、interrupted
考题
The new gym is _________ as the old one.A、three times as largeB、three times the sizeC、three times larger thanD、as three times large
考题
It's hard to believe that some old textbooks ( ) ten years ago ( ) in our university today.
A、publishing/ are been usedB、published/ are usingC、published/ are being usedD、having been published/ are being used
考题
Smoking is so harmful to personal health that it killing ( ) people each year than automobile accidents.A、seven more timesB、seven times moreC、over seven timesD、seven times
考题
The old couple () good times and hard times as well.
A、has seenB、had seenC、have seenD、having seen
考题
We can infer from Dr Myers and Dr. Worm’s paper thatA. the stock of large predators in some old fisheries has reduced by 90%. B. there are only half as many fisheries as there were 15 years ago. C. the catch sizes in new fisheries are only 20% of the original amount. D. the number of larger predators dropped faster in new fisheries than in the old.
考题
No one can expect to fully enjoy the adulthood privileges until he is ________.[A] eleven years old[B] sixteen years old[C] twenty-one years old[D] between twelve and twenty-one years old
考题
Edison invented the light bulb many years ago（改为被动语态）The light bulb__________ __________by Edison many years ago．
考题
共用题干
Earth Rocks onMost of the time,the ground feels solid beneath our feet. That{S comforting. But it's also misleading because there's actually a lot going on underground.Masses of land(called plates)slip,slide,and bump against each other,slowly changing the shape of continents and oceans over millions and billions of years.Scientists know that Earth formed about 4.5 billion years ago.They also know that our planet was hot at first. As it cooled , its outermost layer , called the crust（地壳）, eventually formed moving plates. Exactly when this shift happened,however,is an open question.Now,an international group of researchers has an answer. They'ye found new evidence suggesting that Earth's crust started shifting at least 3.8 billion years ago.The new estimate is 1.3 billion years earlier than previous ones.Not long before 3. 8 billion years ago,lots of asteroids（小行星）were hitting Earth,keeping its crust in a hot,melted state.After the hard crust formed,much of it sank at various times into the planet's hot in- sides.There,it melted before returning to the surface.In some places,however,the crust never sank.One of the oldest such places is in Greenland,in an area called the Isua supracrustal（上地壳） belt. The rocky crust there is between 3. 7 and 3. 8 billion years old. The belt was once part of the seafloor,but now it is exposed to air.The researchers recently took a close look at the Isua supracrustal belt. They noticed long,parallel cracks in the rock that have been filled in with a type of volcanic rock.To explain this structure,the scientists propose that tension in the crust caused the seafloor to crackopen long ago. Hot , liquid rock , called magma（岩浆）,flowed up slowly from deep inside Earth to fill the cracks.Finally,the whole area cooled,forming what we see today.That explanation,plus chemical clues inside the rock,suggests that the Isua supracrustal belt was once part of a plate under the ocean,beginning around 3.8 billion years ago.The formation of the Isua supracrustal belt is thought to have started about 3.8 billion years ago.A:RightB:WrongC:Not mentioned
考题
共用题干
Earth Rocks onMost of the time,the ground feels solid beneath our feet. That{S comforting. But it's also misleading because there's actually a lot going on underground.Masses of land(called plates)slip,slide,and bump against each other,slowly changing the shape of continents and oceans over millions and billions of years.Scientists know that Earth formed about 4.5 billion years ago.They also know that our planet was hot at first. As it cooled , its outermost layer , called the crust（地壳）, eventually formed moving plates. Exactly when this shift happened,however,is an open question.Now,an international group of researchers has an answer. They'ye found new evidence suggesting that Earth's crust started shifting at least 3.8 billion years ago.The new estimate is 1.3 billion years earlier than previous ones.Not long before 3. 8 billion years ago,lots of asteroids（小行星）were hitting Earth,keeping its crust in a hot,melted state.After the hard crust formed,much of it sank at various times into the planet's hot in- sides.There,it melted before returning to the surface.In some places,however,the crust never sank.One of the oldest such places is in Greenland,in an area called the Isua supracrustal（上地壳） belt. The rocky crust there is between 3. 7 and 3. 8 billion years old. The belt was once part of the seafloor,but now it is exposed to air.The researchers recently took a close look at the Isua supracrustal belt. They noticed long,parallel cracks in the rock that have been filled in with a type of volcanic rock.To explain this structure,the scientists propose that tension in the crust caused the seafloor to crackopen long ago. Hot , liquid rock , called magma（岩浆）,flowed up slowly from deep inside Earth to fill the cracks.Finally,the whole area cooled,forming what we see today.That explanation,plus chemical clues inside the rock,suggests that the Isua supracrustal belt was once part of a plate under the ocean,beginning around 3.8 billion years ago.The shape of lands and oceans are slowly changed with the movements of plates.A:RightB:WrongC:Not mentioned
考题
Our factory is much more productive now. This year’s production is five times as much （） it was ten years ago.AwhatBasCthatDthan
考题
单选题When was paper first created?A
About 2000 years ago.B
In the 19th century.C
About 1000 years ago.D
In the 11th century.
考题
问答题Four years ago, Jane was twice as old as Sam. Four years on from now, Sam will be 3/4 of Jane's age. How old is Jane now?
考题
问答题Helen is twenty years old, and her age is four times as much as Mary’s. When Helen’s age is twice as much as Mary’s, how old is Helen then?
考题
问答题When David is twice as old as he is now he will be four times as old as his daughter Jane will be in five years time. If in 1990, four years ago, he was four times as old as his daughter, in what year was she born?
考题
单选题The members in the Senate must be at least （）years old and those in the Representative （）years old.A
40，30B
30，26C
30，25
考题
单选题When was the first story about the monster told?A
200 years ago.B
Over 500 years ago.C
In 1933.D
In 1960.
考题
单选题A: You look more beautiful in such a nice dress. B: ______A
Not at all. This is an old dress.B
Thank you. My mother bought it for me 3 years ago.C
Thanks. But I don’t like it very much.D
It is nice, but it’s very cheap.
考题
单选题Our factory is much more productive now. This year’s production is five times as much （） it was ten years ago.A
whatB
asC
thatD
than
考题
单选题When anchoring a vessel under normal conditions，which scope of chain is recommended? （）A
Four times the depth of waterB
Two and one-half times the depth of waterC
Five to seven times the depth of waterD
Fifteen times the depth of water
考题
单选题What is the normal length of anchor cable used to anchor a vessel?（）A
An amount equal to the depth of the waterB
Two times the depth of waterC
Three to four times the depth of waterD
Five to seven times the depth of water
热门标签
最新试卷
