第二部分：数学答案
勾股数（1） 1.C 2.D 3.60/13cm 4.13 5. 连接B、D，36cm2 6.C
勾(gou)股(gu)数（2）1.C 2.B 3.A 4.130 5.24
实数 1.A 2.C3.正(zheng)负根号5 4.2倍根号2 5.0 5.1
6.（1）2倍(bei)根号2 （2）根号3（3）14+4倍(bei)根号3（4）6
P22 平移与旋转
一(yi)：AB 二：7.5 60
P23
6.（2）解：∵正△ABC
∴AB=BC
又∵△ABD由△ABC旋转
∴△ABD≌△ABC
∴AB=BC=AD=DC
∴四边(bian)形ABCD为菱形
第三部分 英语答案
P37 happy1
一
what a melody(悦耳) song it is!
what a fast boy he is !
what a heavy girl she is !
what a beautiful school it is !
what a good boy he is !
what a beatific(幸福) boy he is!
二
is cleaned
were taken
is maken
was showed
are inviten
wasn't gave
was slolen ; was found
三
turtle
tiger
japan
Mexico
tiger
sierra leone
P39.
一：
better best havier heaviset
more most older oldest
bigger biggest more expensive most expensive
more smart ; most smart better known best known
more badly ; most badly less leas
more carefully most carefully fewer fewest
more slowy most slowy ; thinner thinnest
more healthy most healthy more easily most easily
hotter ; hoyyest oftener oftenest
farer farest ; larger largest
