问题
单项选择题
在离子交换时，溶液的浓度是影响扩散速度时的重要因素，浓度越大，扩散的速度越（）。
A、慢
B、快
答案
参考答案：B
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在离子交换时，溶液的浓度是影响扩散速度时的重要因素，浓度越大，扩散的速度越（）。
A、慢
B、快
参考答案：B
| 用下面方框中所给的单词或短语填空，使句子在逻辑上正确。(提示：选项中有一个是多余的。) | |
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| 1. I need a new jacket. This one doesn't ________ the cold. 2. My shoes were really ________. They only cost 10 dollars. 3. Wait before you buy that cell phone. Let's ________ prices at another store. 4. His uncle took him out to dinner at an ________ restaurant, and the food was very delicious. 5. Working hard at English can ________ you to a wonderful world. |