2006年1月，广东北江和湖南湘江相继发生镉污染事件，引起人们的高度关注。下列有关镉污染的说法中，正确的是 A．镉(元素符号为Cd)属于重金属
I have a______, so the doctor told me to drink lots of water. A. sore back B. headache C. stomachache D. fever
《渔家傲·秋思》中表示在崇山峻岭中，孤城紧闭，戒备森严的句子是：__ _，_ _。
配平□H2O2+□Cr2(SO4)3+□________——□K2SO4+□K2Cr2O4+□H2O。
I phoned my first teacher time and again when I heard that he was ill, yet couldn’t . A. get through B. get along C. get over D. get hold of
同一株水毛茛生长在水中的叶呈丝状，生长在水面的叶呈扁平状，这种性状的不同说明了（ ） A.生物体的性状完全由环境因素控制 B.环境因素引起
Around the world, people have beliefs(信念) about certain food and drink. Some people think that chicken soup is good for a cold. Others believe that it is unhealthy not to eat meat. If you want to
_____ is known to us all is that the 2010 World Expo will take place in Shanghai. A. It B. What C. As D. Which
