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2017中學八年寒假作業答案
寒假作業有了新的定義;少數學校展開了素質實踐活動，將寒假作業變成活動，豐富學生們的課余生活;總體來說.寒假作業給學生帶來了不少負擔。下面是小編整理的關于中學八年寒假作業答案，歡迎參考!
數學答案：
勾股數(1)
1.C 2.D 3.60/13cm 4.13 5. 連接B、D，36cm2
6.C
勾股數(2)
1.C 2.B 3.A 4.130 5.24
實數
1.A 2.C
3.正負根號5 4.2倍根號2 5.0
5.1
6.(1)2倍根號2
(2)根號3
(3)14+4倍根號3
(4)6
P22平移與旋轉
一：AB
二：7.5 60
P23
6.(2)解：∵正△ABC
∴AB=BC
又∵△ABD由△ABC旋轉
∴△ABD≌△ABC
∴AB=BC=AD=DC
∴四邊形ABCD為菱形英語：
英語答案
happy1
一
what a melody(悅耳) 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 計劃做某事 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 拒絕做某事 She asked him for a loan, but he refused.
finish doing 完成某事(后面就不打某事..到時記得自己加上哈)Have you finished reading that magazine?
enjoy dong 擅長....I enjoyed reading these books very much.
practise doing 練習...I practise my swing.
suggest doing 建議..I suggest our going to the park on Sunday
admit doing.承認... I admitted breaking the window.
deny doing否認...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喜歡.. She likes playing the piano
hate to do 遺憾...He hated to have quarrelled with her.
hate to do 討厭 He hated to have quarrelled with her.
remember to do 記住去做某事 Do you remember her telephone number?
remember doing 記得做過某事 I remember telling you about it once.
forget to do 忘記去做某事 I forgot posting the letter.
forget doing 忘記做過某事 Don’t forget to post the letter.
p43
動詞 過去式 過去分詞
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
動詞 過去式 過去分詞
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
科學選擇題答案：
專題一
1. ACBD 增大 100% 降水
P661.①水果導電性與它的酸性有關 ②水果導電性與它本身的質量無關
2. 乙 避雷針 躲入建筑物內或就地蹲下
專題二
P55 壓力不變時，受力面積減小，壓強增大。
BBCCBD
受力面積 壓強 490 增大 水的密度不變時，越深，水內部壓強越大
P57
1.B 2.A A 暖 40 高壓 冷鋒 晴朗干燥 甲乙 A
專題三
二、1、B 2、(1)A (2)A(3)平流，50%-60%。
3、(1)高壓系統，冷鋒系統，晴朗。
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