单选题 The first sentence" ..., the importance of understanding the language of a country cannot be underestimated." most probably means ______.

A、 Understanding of the language of a country is extremely important
B、 Understanding of the language of a country is less important
C、 Not enough importance is attached to the understanding of the language of a country
D、 Enough importance is attached to the understanding of the language of a country

【正确答案】 A

【答案解析】[注释] 此句的“not…under”为双否定结构，意思是肯定的，所以A选项为最佳答案。其他选项的意思有误或原文中没有涉及。