1.There are sixty students in our class.Two-thirds of them are boys,and a quarter of them come to school by bike .Then how many boys in our class come to school by bike?
A.10 B.20 C.30 D.40
2.If▲+□=10 ▲-□=4,what is ▲X□?
A.6 B.14 C.20 D.21
3.A cow walks towards the west,and then it turns to the north at 90 degress.Do you know in which direction the cow's tail is now?
A.west B.south C.east D.down
4.There are 49 birds and hares.A bird was two legs and a hare has four.There are 100 legs in all.So there are( )bieds and ( )hare(s).
A.45,4 B.48,1 C.42,7 D.23,26
5.An old woman took some chickens to the market.By rule,she had to give half of her chickens to the checkpoint,and they gave one of them back ti her.When she lelf the fifith checkpoint,she had only two chickens left.How many chickens did she have when she started?
A.2 chickens B.4 chickens C.16 chickens D.32 chickens
還有一題：
1.（1）Grandpa:You give me three bottles,and I give you a bottle of juice.All right?
Tom:All right.
(2)Dad:Here are 21 bottles of orange juice.Tom.
Tom:Thank you,dad.
(3)Tom:I will drink up all thess bottles of orange juice,and will give the bottles to Grandpa.Then he will give me some bottles of orange juice.
Dad:You are clever.
Tom:How many bottles of orange juice will I drink in all?_____
2.Dr Watson had planted a rather strange-looking plant in the center of the garden at 211 Baker Street.The plant grew rapidly,doubling in size every day.If it took the plant 50 days to cover the whole garden,how long would it take to cover half the garden?________
3.Here are seventeen apples and three boys-Lin Tao,Dave and Tom.Now Lin Tao wants one half;Dave wants one third and Tom wants one ninth.How to divide the apples among them?Please think carefully and help them out,will you?_____