盐水选种是我国劳动人民很早就发明的一种选择饱满种子的方法．现要配制密度为1．1×10³kg／m³的盐水，某农户配制了500 mL样品进行检测，测得这些盐水的质量为600 g．
(1)有根据地说明这样的盐水是否符合要求?如不符合要求，则应采取什么措施?
(2)使样品符合要求时，其总体积是多大?

小东的爸爸从铁匠铺买回外形同样大的铝桶、铁桶各一个，价钱分别是18元、15元，好奇的小东称得铝桶质量为500g、铁桶质量为1500g，妈妈责怪小东的爸爸说：“铁桶便宜，你应该买2个铁桶，”小东的爸爸却说：“其实铝桶不贵，而且铝桶还有不会生锈、提水也轻便”．

项 目 品 种	密度（103kg/m3）	熔点/℃	市场价格/（元/吨）（
铝	2.7	660	16000
铁	8.9	1540	2200

(1)请结合上表分析下列问题．
①小东的爸爸说“铝桶不贵”的依据是：_____________________________________________________
若打制两种小水桶花费的时间相同，你认为店铺打制______桶划算一些。
②小东的爸爸说“铝桶提水轻便”的理由是：外形同样大500g的铝桶和1500g的铁桶的壁厚大约_________，则它们的容积___________，装满水时水的质量________（填“相等”或“不相等”），装满水时铝桶的总质量________（填“相等”或“不相等”）铁桶的总质量，所以说铝桶提水轻便。
(2)现在市场上多以卖塑料小水桶为主，你认为塑料小水桶的优点有：_____________________________
______________________________.缺点有：___________________________________________________.

．初二物理研究小组开展了太湖湖水密度和泥沙含量的研究。
(1) 他们取5L太湖湖水，测得它的质量为5.01kg，请你求出太湖湖水的密度。
(2) 小组讨论认为太湖湖水中泥沙质量的多少与湖水的多少有关。他们把单位体积的太湖湖水中含有泥沙的质量，叫做太湖湖水的含沙量，用字母x表示。请写出太湖湖水含沙量的计算公式，并说明公式中各物理量是什么。
(3) 初二(3)班有一女生研究小组，她们无法直接获取太湖湖水，因而设计并进行太湖湖水含沙量的模拟研究。她们在一个量筒里放入50g干燥的“黄土”，先倒入250mL清水，接着每次加入50mL清水配制成不同的泥沙水，并分别测出不同泥沙水的体积。她们的有关实验数据见下表。

① 分析表中有关数据，你认为泥沙水的含沙量和泥沙水的密度有什么关系？
② 研究小组发现，她们的实验可以测得“黄土”的密度，请你根据数据计算出“黄土”的密度，并作必要的说明。

单位体积某种_________，叫做这种物质的密度．国际单位制中，密度的单位是________，水的密度是________，表示的意义是________________________________．

三个实心的铜块，铝块、铅块相比较，当它们的体积相同时，________的质量最大，
________的质量最小；当它们的质量相同时，________的体积最大，的体积最小．

某品牌的饮用纯净水，瓶中水的体积是350m L．则水的质量是_________kg．

_______, you need to give all you have and try your best.

A．Being a winner.

B．To be a winner

C．Be a winner

D．Having been a winner

.
Suppose you want to bring home a new cat and are looking for a way to really make it feel at home. Actually, all you need to do is buy some nice cat furniture and have it in place by the time you bring it into your home.
The first thing that you should prepare is a cat house. Two to three feet off the ground is the best height. If you don’t have enough room for a cat house, a cat bed is also a nice choice.
Once you have a nice spot where your cat can go to feel safe, then it’s time to get cat furniture that offers your pet a nice place to play. One nice choice is cat trees. Scratching posts (猫抓板) are another great idea if you are short on space, but still want to give your cat a nice place where it can claw (抓) at instead of your own furniture.
If you’re looking for a great way to shop for cat furniture, simply turn on your computer and do some online shopping. In no time will you be able to browse (浏览) all the offerings from many online stores. What’s great is that you can easily compare products and their prices, so you can get what you want at the best possible price. And, probably the nicest thing about online shopping is that your purchases may be shipped right to you, so you don’t have to waste time making a trip to the store.
So, if you have brought a new cat into your home, make sure that home is an inviting one by buying some new cat furniture. Without it, your cat might feel lost and unsafe, which you definitely do not want to happen.
63. What should you do first before you bring a cat home?
A. Buy a cat house and some cat furniture.
B. Find a proper place for the cat to sleep.
C. Learn how to take care of the cat.
D. Know how to buy cat furniture online.
64. According to the author, the first concern for a cat house is __________.
A. its height      B. its size      C. its price        D. safety
65. What is the best choice for your cat to play with if you have little room?
A. The cat bed.                          B. Scratching posts.
C. Your own furniture.                     D. Cat trees.
66. What is the author’s advice on shopping for cat furniture?
A. Compare products and their prices and get the cheapest ones.
B. Try to save time and money when you buy cat furniture.
C. Do some online shopping and get products with reasonable prices.
D. Buy furniture that can be shipped to you as quickly as possible.

.
Suppose you want to bring home a new cat and are looking for a way to really make it feel at home. Actually, all you need to do is buy some nice cat furniture and have it in place by the time you bring it into your home.
The first thing that you should prepare is a cat house. Two to three feet off the ground is the best height. If you don’t have enough room for a cat house, a cat bed is also a nice choice.
Once you have a nice spot where your cat can go to feel safe, then it’s time to get cat furniture that offers your pet a nice place to play. One nice choice is cat trees. Scratching posts (猫抓板) are another great idea if you are short on space, but still want to give your cat a nice place where it can claw (抓) at instead of your own furniture.
If you’re looking for a great way to shop for cat furniture, simply turn on your computer and do some online shopping. In no time will you be able to browse (浏览) all the offerings from many online stores. What’s great is that you can easily compare products and their prices, so you can get what you want at the best possible price. And, probably the nicest thing about online shopping is that your purchases may be shipped right to you, so you don’t have to waste time making a trip to the store.
So, if you have brought a new cat into your home, make sure that home is an inviting one by buying some new cat furniture. Without it, your cat might feel lost and unsafe, which you definitely do not want to happen.
63. What should you do first before you bring a cat home?
A. Buy a cat house and some cat furniture.
B. Find a proper place for the cat to sleep.
C. Learn how to take care of the cat.
D. Know how to buy cat furniture online.
64. According to the author, the first concern for a cat house is __________.
A. its height      B. its size      C. its price        D. safety
65. What is the best choice for your cat to play with if you have little room?
A. The cat bed.                          B. Scratching posts.
C. Your own furniture.                     D. Cat trees.
66. What is the author’s advice on shopping for cat furniture?
A. Compare products and their prices and get the cheapest ones.
B. Try to save time and money when you buy cat furniture.
C. Do some online shopping and get products with reasonable prices.
D. Buy furniture that can be shipped to you as quickly as possible.

.
Suppose you want to bring home a new cat and are looking for a way to really make it feel at home. Actually, all you need to do is buy some nice cat furniture and have it in place by the time you bring it into your home.
The first thing that you should prepare is a cat house. Two to three feet off the ground is the best height. If you don’t have enough room for a cat house, a cat bed is also a nice choice.
Once you have a nice spot where your cat can go to feel safe, then it’s time to get cat furniture that offers your pet a nice place to play. One nice choice is cat trees. Scratching posts (猫抓板) are another great idea if you are short on space, but still want to give your cat a nice place where it can claw (抓) at instead of your own furniture.
If you’re looking for a great way to shop for cat furniture, simply turn on your computer and do some online shopping. In no time will you be able to browse (浏览) all the offerings from many online stores. What’s great is that you can easily compare products and their prices, so you can get what you want at the best possible price. And, probably the nicest thing about online shopping is that your purchases may be shipped right to you, so you don’t have to waste time making a trip to the store.
So, if you have brought a new cat into your home, make sure that home is an inviting one by buying some new cat furniture. Without it, your cat might feel lost and unsafe, which you definitely do not want to happen.
63. What should you do first before you bring a cat home?
A. Buy a cat house and some cat furniture.
B. Find a proper place for the cat to sleep.
C. Learn how to take care of the cat.
D. Know how to buy cat furniture online.
64. According to the author, the first concern for a cat house is __________.
A. its height      B. its size      C. its price        D. safety
65. What is the best choice for your cat to play with if you have little room?
A. The cat bed.                          B. Scratching posts.
C. Your own furniture.                     D. Cat trees.
66. What is the author’s advice on shopping for cat furniture?
A. Compare products and their prices and get the cheapest ones.
B. Try to save time and money when you buy cat furniture.
C. Do some online shopping and get products with reasonable prices.
D. Buy furniture that can be shipped to you as quickly as possible.