— Ningbo _______a lot in the past10 years.— Yeah, you`re right.A. changes B. has changedC.has been changed D. will change
下列污染现象主要与二氧化硫有关的是（ ） A. 光化学烟雾 B. 酸雨 C. 白色污染 D. 臭氧层空洞
Fresh air and exercise can healthy bodies. A.form B.develop C.make D.discover
CPI是用于衡量某一固定消费品集合价格水平的指数，CPI越大，表明物价越高。下表列出了某年份我国三个城市的人均工资与CPI。若考虑物价因素，三个
Jenny Bowen, an American living in Beijing, was selected, as the only American to carry the 2008 Beijing Olympic torch on Chinese soil．She and seven other non-Chinese winners had been chosen from 26
词汇；根据句意和汉语提示写出单词，完成句子，每空一词。 1. As we all know, Zhang Yimou is a famous __________ . (导演) 2. Mrs Smith does exercise every day in order to __
化学与生产，生活密切相关。下列说法正确的是 A．在燃放烟花爆竹时，硫燃烧生成SO3 B．六水氯化钙可用作食品干燥剂 C．太阳能电池板的材料是
如图7-5-13所示，底面积为2a2的两个圆柱形容器，底部用细管连接，左边容器的水面浮着一个边长为a的正方形木块，木块的一半浸在水中.现将木块慢慢提
是函数
的零点，若
的值满足（ ）
B．
D．
的符号不能确定