发展的实质是（）
A.永不停息的运动和变化
B.事物从过去到现在到将来的变化
C.新事物的产生，旧事物的灭亡
D.前进性和曲折性的统一
参考答案：C
根据句意及汉语或首字母提示，填写恰当的单词。
1. It's not right to _________ (浪费) time or money.
2. The cold weather ________ (造成) many plants to die last year.
3. Since my sister started high school, her________ (日常的) life has changed.
4. It's bad for your teeth to eat c_________ all the time.
5. Juan Antonio Samaranch's d_________ made all of us sad.
一根铁丝可以围成一个半径是3厘米的圆，这根铁丝有多长？它所围成的圆的面积有多大？
