题目

When we talk about the great             in the past 70 years in China, we can see the pride on all Chinese people' s faces. A.agreements                   B. arguments                                C. achievements 答案：C     正三棱锥的一个侧面面积与底面面积之比为2：3，则此三棱锥的高与斜高之比为（ ）A．B．C．D．