小学四年级下册数学探究题，不是很难，但列算式很烦。急急急急急急急急！！！
对：T
错：F
1.My name is Sun Wei.I’m an American boy.His name is David Smith.He is twelve.And I am twelve,too.David is in Class Three Grade One.I am in Class Three Grade One,too.He is Number Eight,Row Five.I am Number Five,Row Four.We are good friend.( )1.David is an American boy.( )2.I am eleven.( )3.He is in Class Two Grade One.( )4.We are’t good friend.2.Tom is seven,he goes to school every day.The school is next to his home.So he goes there on foot and comes back home on time.But today he is late.His mother asks him :“Why are you late today?”“I’m in the headmaster(校长)’s office(办公室).”“Why do you go to the headmaster’s office?”“Because my teacher asks us a question in class,and nobody(没有人) can answer it,but I can.”“It’s good to answer the teacher’s questions,what’s the question?”“The question is---who puts ink(墨水) on my chair?”
( )1.Tom’s home is not far from his school.
( )2.Tom goes to school by bike.
( )3.Tom puts ink on the teacher’s chair.
( )4.It is good for Tom to do.
( )5.Tom is six.
( )6.Tom goes to the teacher’s office.
3.Fred and Jean are brother and sister.They are Americans.They are in the same school.Their school is not far from their home.Fred is in Mr Black's class.He is thirteen.He is one of the best students in his class.Mr Black likes him.He is good at Chinese,but Mr Black is not.Jean is eleven.She is in Mrs Black's class.Mrs Black is an English teacher.Jean is good at English,but she is not good at Chinese.
( )1.Are Fred and Jean twins(双胞胎)?
A.Yes,they are.
B.No,they aren't.
C.Yes,they are in the same class
D.No, they are not American.
( )2.How old is Jean?She is_____________.
A.Eleven
B.twelve
C.Thirteen
D.Ten
( )3.Who is good at Chinese?
A.Mr Black
B.Mrs Black
C.JeanD.Fren
( )4. Where is Fred and Jean's school?
A.It's in China.
B.It's behind a hill.
C.It's near their home.
4. One day Mr. and Mrs.White go shopping by car.They stop their(他们的) car near(附近) a store(商店).They buy(购买) a lot(许多) of things(物品) and they want to put the things in the car.But Mr.White can’t open the door of the car,so they ask a policeman to help them.The policeman is very friendly(友好的) to help them.Just(这时) then a man comes up and shouts(大喊):“What are you doing with my car?”Mr. and Mrs.White take a look at the car’s number and they are frozen(尴尬、刻板) there.It isn’t their car.
( )1.Mr. and Mrs.White drive(驱动) for _______.
A.Fishing
B.Shopping
C.Business
( ) 2. They stop their car _________.
A.at the parking spot(停车场)
B.near the sea(海)
C.near the store
( ) 3. They want to put the things _______.
A.in a big bag
B.in their car
C.in other(其他)’s car
( )4.Mr.White can’t open the car,so________.
A. they walk(走) home
B. they ask a policeman to help
C. they call a taxi5.
5.Jim is an English boy.He comes to China with his father and mother.They come here to work. Jim comes here to study.
He is in No.5 Middle School(第五中学).He gets up early every day.He isn’t late for school. He studies(努力) hard(学习).He can read English well.He often(经常) helps us with our English,and we often help him with his Chinese.After class(下课后) he likes playing football, swimming, running, jumping and andriding(骑马).He makes(让) many friends here.We are glad(很高兴) to stay(暂住) with him.On(在) Sunday(周日),he often helps his mother clean the house,mend(修补) something (一些) or do the shopping.He likes Chinese food(食品) very much.
He likes living(生活) here.He likes Chinese students very much.We all like him, too.
( )1.He gets up late every day.
( )2.He often teaches us English.
( )3.After class,he likes singing and playing basketball.
( )4.On Sunday he often helps his mother clean the house.
( )5.He doesn’t like Chinese food.
一定要给分啊！很累的诶！
1.12+15+18
2.125*15*8
3.125×25×8×4
4.30*125-120/6
5.17×（35+480÷6）
6.270÷[18×（51-46）]
7.498-154-46
8.45+36-45+36
1成人、5儿童：180×1+80×5=580元 100×6=600元
2成人、4儿童：180×2+80×4=680元 100×6=600元
3成人、3儿童：180×3+80×3=780元 100×6=600元
4成人、2儿童：180×4+80×2=880元 100×6=600元
5成人、1儿童：180×5+80×1=980元 100×6=600元
经比较可知，六人中只有儿童达到5人时，选择第一种方案便宜；儿童人数在1—4人时，均应选择第二种方案。
解析：
方案二：六人费用100×6=600(元)
方案一：六个成人费用180×6=1080(元)，六人中每对换1个儿童费用减少(180-80)=100元
显然当6人中儿童为5人时，费用1080-500=580(元)，费用低于方案二
每六个人中儿童人数等于或多于5人时，选择方案一便宜，人数少于5人时选择方案二便宜。
方案一;成人180元+儿童80元=260元一大一小.方案二;团体6人以上每人100元.如果儿童在2个以上的话应选择方案二;如果一大一小就选择方案一.最合适了.
方案二六人中儿童人数在1--4人范围内
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