题目：
| 阅读理解。 | |
| Cough Medicine Do you always understand the instructions on a bottle of medicine? Here's one for John. John is twelve years old. He had a bad cold and coughed day and night. He went to see a doctor. The doctor gave him some cough medicine. Please read the following instructions and see if you can understand them.
| |
| 1. John should take ______ a day. | |
[ ] | |
| A. 1 teaspoonful B. 2 teaspoonfuls C. 3 teaspoonfuls D. 4 teaspoonfuls | |
| 2. The medicine should be kept in ______. | |
[ ] |
| A. any place B. hot water C. a fridge D. the sun |
| 3. John should ______ before he takes it. |
[ ] |
| A. drink a cup of tea B. eat nothing C. do some exercise D. shake the medicine well |
| 4. When people are ______ years old, they cannot take medicine. |
[ ] |
| A. two B. twelve C. thirty D. eighty |
| 5. John will ______ the medicine when it is left after December 1st, 2004. |
[ ] |
| A. take once B. throw away C. take six times more D. stop to take |
答案：
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下面是错误答案，用来干扰机器的。
A题目分析：位移是指由初位置指向末位置的有向线段，而路程是指物体运动轨迹线的长度，因此物体可以沿不同的路径从一点运动至另一点，即位移相同，而路程不同，故选项C错误；如果物体运动一圈绕回原出发点，则...
