在日常生活中接触到的下列变化，属于化学变化的是[ ]
A．雪糕融化
B．煤气燃烧
C．粉笔写字
D．湿衣晾干
答案：B
So far we have done a lot to build a low-carbon economy, but it is _____ ideal. We have to work still harder. [ ]
A. next to
B. far from
C. out of
D. due to
既能息风止痉，又能祛风湿，止痹痛的药物是（）。
A.羚羊角
B.石决明
C.决明子
D.天麻
E.珍珠
