如题所述
物理：
练习一：
一.选择题
1.C 2.D 3.B 4.D 5.B 6.D 7.B 8.D 9.B 10.A 11.A 12.D 13.A 14.A 15.D
二.填空与作图题
16.（1）：kg；（2）：g
17.5：1；5：1；1：1.
18.质量；绝缘。
19.较大 大 小
20. 66；60；1.1
21. 19.3×10³ ；金；0.29
22. 60；83；1200
23.大 ；大
24.
（1）主要器材：
密度表、小铁球、天平和量筒
（2）简要做法：
用天平称出小球质量、用量筒测出小球的体积.
（3）如何判断：
算出该小球的密度对照密度表进行判断：若ρ测＜ρ铁，则小铁球是空心的；若ρ测=ρ铁，则小铁球是实心的.
25. 0.8；55
26.27；20；1.35×10³；相等
三、解答与探究题
27.（1）.游码；平衡螺母（2）B、A、C（3）50（4）在操作过程中，手不能调节平衡螺母。
28.（1）62；（2）20；（3）3.1
29.（1）m=79g，v=75-60=15cm³，P=m/v=79/15≈5.3×10³kg/m³，因为5.3×10³kg/m³≠7.9×10³kg/m³，所以空心的。
（2）V1=m/P=79/7.9=10cm³，V2=15cm³，V=15-10=5cm³ 所以是5cm³
30.解：容积设为V，瓶的质量设为M，已知水的密度为1g/cm3，酒精密度为0.8g/cm3，有：
1V+M=400
0.8V+M=350
解出：V=250cm3，M=150g
答：空瓶的质量是150g，容积是250ml
31.
解：
汽车所用钢材的体积为： <?xml:namespace prefix = m />V钢=m钢/ρ钢=237/（7.9×10³）m³=3.0×10-2m³．
所用聚丙烯塑料的体积为V=V钢=3.0×10-2m3
所用聚丙烯塑料的质量为m=ρV=1.1×103×3×10-2Kg=33Kg
减轻质量为：△m=m钢-m=237-33=204Kg．
答：可减少质量204Kg．
语文：http://wenku.baidu.com/view/d8eb35f59e31433239689398.html
英语：楼上的答了
练习一：
一.选择题
1.C 2.D 3.B 4.D 5.B 6.D 7.B 8.D 9.B 10.A 11.A 12.D 13.A 14.A 15.D
二.填空与作图题
16.（1）：kg；（2）：g
17.5：1；5：1；1：1.
18.质量；绝缘。
19.较大 大 小
20. 66；60；1.1
21. 19.3×10³ ；金；0.29
22. 60；83；1200
23.大 ；大
24.
（1）主要器材：
密度表、小铁球、天平和量筒
（2）简要做法：
用天平称出小球质量、用量筒测出小球的体积.
（3）如何判断：
算出该小球的密度对照密度表进行判断：若ρ测＜ρ铁，则小铁球是空心的；若ρ测=ρ铁，则小铁球是实心的.
25. 0.8；55
26.27；20；1.35×10³；相等
三、解答与探究题
27.（1）.游码；平衡螺母（2）B、A、C（3）50（4）在操作过程中，手不能调节平衡螺母。
28.（1）62；（2）20；（3）3.1
29.（1）m=79g，v=75-60=15cm³，P=m/v=79/15≈5.3×10³kg/m³，因为5.3×10³kg/m³≠7.9×10³kg/m³，所以空心的。
（2）V1=m/P=79/7.9=10cm³，V2=15cm³，V=15-10=5cm³ 所以是5cm³
30.解：容积设为V，瓶的质量设为M，已知水的密度为1g/cm3，酒精密度为0.8g/cm3，有：
1V+M=400
0.8V+M=350
解出：V=250cm3，M=150g
答：空瓶的质量是150g，容积是250ml
31.
解：
汽车所用钢材的体积为： <?xml:namespace prefix = m />V钢=m钢/ρ钢=237/（7.9×10³）m³=3.0×10-2m³．
所用聚丙烯塑料的体积为V=V钢=3.0×10-2m3
所用聚丙烯塑料的质量为m=ρV=1.1×103×3×10-2Kg=33Kg
减轻质量为：△m=m钢-m=237-33=204Kg．
答：可减少质量204Kg．
语文：http://wenku.baidu.com/view/d8eb35f59e31433239689398.html
英语：楼上的答了
温馨提示：答案为网友推荐，仅供参考
第1个回答 2012-07-07
练习一
一．CCCBCBDDBDCAAAB
二.CBBBACDCBA
三.CAAABCDBDB
四.unimportant reading ours useless to take airport instead To solve runners straight
五.taller than an called beacause of does mean as well
六.short small eyesight true willing humour jokes social grows future七.4th pets bedrooms good（很不确定） $220 When was she born? Does everyone think she is very pretty? D dacb Lin Miaoke
练习二
一.CCDDCCCDACBDADCBABBA
二.DCDACBBCBB
三.ABCCBCDAAC
四.discussing foggy was mopping carelessly useless studying lost encourages example serious continue training arriving others hurry
五.killed play after with laugh up How because If freel
六.cloudy Four Yes Singapore winter November Sam called Ten came
练习三
一.BACBDCDAAA
二.DCABAACDBB
三.DCBAB
四.kind haven't traveled pollution has been haven't heard fresh lent uesd nature natural realized
五. from time to time have bought for When did buy haven't eaten yet How many times been to六.widely use important If will kind written useful another helping七.Ester White House 3000 have fun 1878 （四、五、六、七题貌似有点问题、、、）
练习四
一.DDBCDAAABD
二.CCACADBCCA
三.BBDC
四.cheerful was watching was washing came to finish don't tell motorcycle abroad cute sailing cultural
五.get smile an old woman sitting in the park She took it and smiled at him. 当男孩打开他家门时，他妈妈惊奇地看见他脸上的快乐并且问他什么使得他如此快乐。 most beautiful
六.bus sixty lived week went age first ( ) paid card本回答被网友采纳
一．CCCBCBDDBDCAAAB
二.CBBBACDCBA
三.CAAABCDBDB
四.unimportant reading ours useless to take airport instead To solve runners straight
五.taller than an called beacause of does mean as well
六.short small eyesight true willing humour jokes social grows future七.4th pets bedrooms good（很不确定） $220 When was she born? Does everyone think she is very pretty? D dacb Lin Miaoke
练习二
一.CCDDCCCDACBDADCBABBA
二.DCDACBBCBB
三.ABCCBCDAAC
四.discussing foggy was mopping carelessly useless studying lost encourages example serious continue training arriving others hurry
五.killed play after with laugh up How because If freel
六.cloudy Four Yes Singapore winter November Sam called Ten came
练习三
一.BACBDCDAAA
二.DCABAACDBB
三.DCBAB
四.kind haven't traveled pollution has been haven't heard fresh lent uesd nature natural realized
五. from time to time have bought for When did buy haven't eaten yet How many times been to六.widely use important If will kind written useful another helping七.Ester White House 3000 have fun 1878 （四、五、六、七题貌似有点问题、、、）
练习四
一.DDBCDAAABD
二.CCACADBCCA
三.BBDC
四.cheerful was watching was washing came to finish don't tell motorcycle abroad cute sailing cultural
五.get smile an old woman sitting in the park She took it and smiled at him. 当男孩打开他家门时，他妈妈惊奇地看见他脸上的快乐并且问他什么使得他如此快乐。 most beautiful
六.bus sixty lived week went age first ( ) paid card本回答被网友采纳
