问题
选择题
构成人体细胞的主要成分中含量最多的是（ ）
A．水
B．蛋白质
C．无机盐
D．维生素
答案
组成细胞的物质既有有机物又有无机物．无机物有水分和无机盐，有机物有糖类、蛋白质、核酸和脂类．在细胞的组成成分中，无机物中的水是最主要的成分，约占细胞物质总含量的75%-80%．
故选：A
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构成人体细胞的主要成分中含量最多的是（ ）
A．水
B．蛋白质
C．无机盐
D．维生素
组成细胞的物质既有有机物又有无机物．无机物有水分和无机盐，有机物有糖类、蛋白质、核酸和脂类．在细胞的组成成分中，无机物中的水是最主要的成分，约占细胞物质总含量的75%-80%．
故选：A
| 阅读理解。 | ||
| Good morning! Welcome to our food shop. We have many things on sale. Please come in and have a look! Please look at our ads (广告). Would you like some of them? Some food isn't on the ads, such as (如) chicken and fish. The chicken is $20 a kilo and the fish is $25 a kilo.
| ||
| 1. The ads are for ________. | ||
| A. a toy shop B. a clothes shop C. a food shop | ||
| 2. Mrs Green can buy three kilos of eggs with ________. | ||
| A. $15.00 B. $10.00 C. $12.00 | ||
| 3. You have only $7.00, and you can buy ________. | ||
| A. two kilos of oranges B. two bottles of milk C. three bottles of orange juice | ||
| 4. You have $60.00 now. You can buy ________ of apples or ________ of rice. | ||
| A. 15 kilos; 2 bags B. 12 kilos; 3 bags C. 20 kilos; 1 bag | ||
| 5. Which is TRUE? | ||
| A. In this shop, you cannot buy any food with only $3.00. B. This shop doesn't have any chicken. C. Fish isn't on the ads, but we can buy it in the shop. |