⑴____ A. ruler B. her C. teacher
⑵____ A. bear B. dear C. hear
⑶____ A. hobby B. over C. pocket
⑷____ A. front B. month C. orange
⑸____ A. grass B. cage C. skate
a.除去石灰水中悬浮的碳酸钙颗粒____;
b.除去氯化钠中混有的碘单质(碘易由固态变为气态)____;
c.分离水与苯的混合物____;
d.分离氯化钠和硝酸钾的混合物____.