AMC 8 2024 Problem 10
AMC8 2024 年第 10 题
表达式与运算★☆☆☆☆
In January 1980, the Mauna Loa Observatory recorded carbon dioxide (CO₂) levels of 338 ppm (parts per million).
Over the years, the average CO₂ reading has increased by about 1.515 ppm per year.
What is the expected CO₂ level in January 2030, in ppm? Round your answer to the nearest integer.
1980年1月，莫纳罗亚天文台记录的二氧化碳浓度为338ppm（百万分之一)。近年来，二氧化碳浓度平均每年增加约1.515ppm。请问2030年1月的二氧化碳浓度预计为多少ppm？将答案四舍五入到最接近的整数。
- A.399
- B.414
- C.420
- D.444
- E.459
正确答案 · Correct Answer
B
解析 · Solution
解析整理中
继续练习