题目

如图所示，在小试管中加入的浓硫酸，则观察到U型管中的液面（填“a升高b降低”或“a降低b升高”），集中瓶中观察到的现象是。 答案：【1】a降低b升高【2】澄清石灰水变浑浊用所词的适当形式填空。 1. A large number of _____ (foreign) visit Guizhou province these years. 2.Thank goodness! The letter I looking forward to _____ (reach) me at last. 3. Hainan Island is a ______ (wonder) place to spend summer. 4. The dinner room must _____ (clean) three times a day. 5.My cousin is used to _______ (study) with his new friends in Australia.