同一山头有三个以上冰斗同时进行溯源侵蚀形成的锥形孤峰，是（    ）

单项选择题已 知 (NH3·H2O) = 1.8 ×10-5， 在 含 有 0.020 mol·L-1 NH3·H2O 和 0.010 mol·L-1 KOH 混 合 溶 液 中，c (NH4+ ) 为

问答题Section AIn this section, you will read 10 incomplete sentences. You are required to complete each sentence with the right word chosen from the word bank. Yellowstone National Park is an important ______ attraction in the USA. He studied English to degree ______ . It is ______ much colder than this in December. This is one of the most ______ songs in the 1980s. She has been feeling ______ all week. This is one of the most ______ business district in the city. After the long journey, the kids are getting tired and ______. It has turned from sunny to ______ in the afternoon. She switched on the bedside ______when she heard a strange noise in the living room. The lecture is about how to ______ pressure in daily life.