小题1:在这段期间，发音也经历了巨大的变化。

Pronunciation also ______ _______ huge changes during this period.

小题2:汉语与西方语言不同，区别在于它不使用字母，而是用汉字表示思想、物体和行为。

The Chinese language _____ ______ Western languages _____ _____, instead of an alphabet, it uses characters which stand for ideas, objects or deeds.

小题3:不幸的是，全城的人都被活埋了，整座城市也被淹埋了。

_______,people in the city were all buried alive, and _____ ______ _____ _______.

小题4:他被送上法庭之后极力为自己辩护。

After he was______ ______ ______,he tried his best to ______ ______.

小题5:希望工程旨在帮助贫困儿童上学。

Project Hope ______　______ ________help those children who are too poor to go to school.

导致萃取槽产生大量泡沫的原因有（）

A、矿中含大量碳酸盐

B、矿浆中含大量有机物

C、矿中含大量倍半氧化物

D、矿中含大量钾、钠盐