问题
选择题
把四个马铃薯条分别放入Ⅰ―Ⅳ四种不同浓度的盐水中，一小时后，马铃薯条质量的变化率如下表所示。下列结论正确的是
A．溶液Ⅰ的浓度最高
B．溶液Ⅲ的浓度高于溶液Ⅱ
C．溶液Ⅲ的浓度最低
D．溶液Ⅳ是蒸馏水
答案
答案：B
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把四个马铃薯条分别放入Ⅰ―Ⅳ四种不同浓度的盐水中，一小时后，马铃薯条质量的变化率如下表所示。下列结论正确的是
A．溶液Ⅰ的浓度最高
B．溶液Ⅲ的浓度高于溶液Ⅱ
C．溶液Ⅲ的浓度最低
D．溶液Ⅳ是蒸馏水
答案：B
| 阅读理解。 | |
| Do you like children? Do you have free time in the afternoon? We need a babysitter for our son. He's six years old. Hours are from 3:00 pm to 8:00 Pm, Monday to Friday. Sometimes you will work on weekends. The pay is $10 per hour. For the job, you will:
| |
| 1. What's the Chinese meaning for "babysitter"? | |
[ ] | |
| A.小孩 B.姐姐 C.幼儿 D.保姆 | |
| 2. The babysitter works for ______ hours from Monday to Friday. | |
[ ] | |
| A. 12 B. 5 C. 25 D. 15 | |
| 3. How much can the babysitter get if she works for three hours? | |
[ ] | |
| A. $10 B. $20 C. $30 D. $40 | |
| 4. The babysitter has to work in ______. | |
[ ] | |
| A. Shanghai B. Nanjing C. Beijing D. Dalian | |
| 5. Which of the following is TRUE? | |
[ ] | |
| A. The time for the job is from morning to evening. B. The babysitter has to watch TV with the kid. C. Sometimes the babysitter will work on weekends. D. The five-year-old boy needs a babysitter. |