题目

如图，甲为石蜡分解装置图，乙为改进后的装置图，乙可明显缩短实验时间。下列说法错误的是（） A . 碎瓷片的作用是防止暴沸 B . 矿渣棉浸透石蜡油的目的是保证产生足够多的气体供后续实验使用 C . 酸性KMnO4溶液褪色证明石蜡油分解产生的气体发生了氧化反应 D . 乙的优点是反应物与催化剂充分接触，酒精灯火焰集中 阅读理解 　　Life on land probably bagan about 430 million years ago, though it has existed in the water for perhaps as much as 3,000 million years．When we think of the first life on land, we probably think of strange animals coming out of the oceans, but, in fact, no animals could have been living if plants had not been on land first．Plants had to be on land before animals arrived．They supplied the first land animals with the surrounding and food necessary, since they－the plants are the only form of life that is able to get and store energy． 　　The first plants to exist out of the water were probably certain kinds of algae(海藻)which were followed by other plants that grew close to the ground and needed water in which to reproduce．Once the move to land had been made, however, evolution(进化)took place quickly．By the end of 100 million years, plants had developed their roots(根), and some had got tree-like forms since height was very important in gaining sunlight．About 300 million years ago, much of the world was covered with forests of huge trees．In most ways they were like modern trees．They had roots, leaves, wood, but mostly they had not developed seeds． (1) The main idea of the first paragraph is ________． [　　] A． life on land probably began about 430 years ago B． the first animal on land came from oceans C． there wouldn't be animals without plants D． plants are the only form of life that is able to get and store energy (2) Which of the following is TRUE? [　　] A． Algae has existed for more than 430 million years． B． It is impossible that algae might be the earliest plant on land． C． Plants get food from animals in the oceans． D． Evolution began after animals appeared on land． (3) Plants with roots appeared about ________ million years ago． [　　] A． 430 B． 300 C． 330 D． 100