问题
选择题
The actress is already 50, but she looks _______ than she really is. [ ]
A. young
B. more young
C. more younger
D. much younger
答案
答案：D
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The actress is already 50, but she looks _______ than she really is. [ ]
A. young
B. more young
C. more younger
D. much younger
答案：D
某同学去我市石门县壶瓶山风景区游玩，带回了几小块石灰石样品．为了检测样品中碳酸钙的含量，他称取10.0g样品，将60.0g稀盐酸分四次加入，测量的有关数据见下表（已知样品中的杂质不溶于水，且不与稀酸盐反应）．
| 加入稀盐酸的次序 | 1 | 2 | 3 | 4 |
| 加入稀盐酸的质量（g） | 15.0 | 15．O | 15.0 | 15.0 |
| 剩余固体的质量（g） | 7．O | 4．O | 1．O | 1．O |
（2）10.0g该样品与足量稀盐酸反应后可产生二氧化碳多少克？（计算结果精确到小数点后两位）