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2017中学八年寒假作业答案
寒假作业有了新的定义;少数学校展开了素质实践活动，将寒假作业变成活动，丰富学生们的课余生活;总体来说.寒假作业给学生带来了不少负担。下面是小编整理的关于中学八年寒假作业答案，欢迎参考!
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
勾股数(2)
1.C 2.B 3.A 4.130 5.24
实数
1.A 2.C
3.正负根号5 4.2倍根号2 5.0
5.1
6.(1)2倍根号2
(2)根号3
(3)14+4倍根号3
(4)6
P22平移与旋转
一：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
∴四边形ABCD为菱形英语：
英语答案
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
P40一：
plan to do 计划做某事 He planned on taking his vacation in July.
hope to do 希望做某事 We hope to see you soon.
agree to do 同意做某事 No results found for agree to do.
refuse to do 拒绝做某事 She asked him for a loan, but he refused.
finish doing 完成某事(后面就不打某事..到时记得自己加上哈)Have you finished reading that magazine?
enjoy dong 擅长....I enjoyed reading these books very much.
practise doing 练习...I practise my swing.
suggest doing 建议..I suggest our going to the park on Sunday
admit doing.承认... I admitted breaking the window.
deny doing否认...He denied having seen these watches before.
arrange for 安排...I’ve arranged for a taxi.
offer to do 提供They offered to help me
like/love+doing喜欢.. She likes playing the piano
hate to do 遗憾...He hated to have quarrelled with her.
hate to do 讨厌 He hated to have quarrelled with her.
remember to do 记住去做某事 Do you remember her telephone number?
remember doing 记得做过某事 I remember telling you about it once.
forget to do 忘记去做某事 I forgot posting the letter.
forget doing 忘记做过某事 Don’t forget to post the letter.
p43
动词 过去式 过去分词
be was been
cook cooked cooked
know knew known
swim swan swam
get
got got
teach tought taught
leave left left
fell felt felt
smell smelt smelt
drive drove driven
run ran run
think thought thought
keep kept kept
buy bought bought
begin began began
do did done
cost cost costfind found found
throw threw throw
stand stood stood
动词 过去式 过去分词
speak spoke spoken
come came come
give gave given
hear heard heard
send sent sent
hurt hurt hurt
see saw seen
steal stole stolen
take took taken
sleep slept slept
sit sat sat
meet met met
bring brought brought
fly flew flown
wake woke waken
choose chose chosen
lose
lost lost
read read read
rise rose risen
wear wore worn
P50
Early to bed
Get up early to exercise every day
To eat less fatty food and more milk.
Do not eat too many sweet can cause obesity.
In the case of hot weather drink plenty of water.
Can not drink beverages,drink plenty of water.
In the winter changes according to the right to add their own clothes to not cath a cold
The eyes will not watch TV much,so choose the appropriate time watching TV.
Playing games in not good for mental and physical,we need to less play
科学选择题答案：
专题一
1. ACBD 增大 100% 降水
P661.①水果导电性与它的酸性有关 ②水果导电性与它本身的质量无关
2. 乙 避雷针 躲入建筑物内或就地蹲下
专题二
P55 压力不变时，受力面积减小，压强增大。
BBCCBD
受力面积 压强 490 增大 水的密度不变时，越深，水内部压强越大
P57
1.B 2.A A 暖 40 高压 冷锋 晴朗干燥 甲乙 A
专题三
二、1、B 2、(1)A (2)A(3)平流，50%-60%。
3、(1)高压系统，冷锋系统，晴朗。
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