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 their 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 modem trees. They had roots, leaves, wood, but mostly they had not developed seeds.
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
第2题
下列有关超声雾化吸入目的,不正确的叙述是
A.预防感染
B.解除痉挛
C.稀释痰液
D.消除炎症
E.缓解缺氧
第3题
下列有关超声雾化吸入的目的,不正确的叙述是()
A.预防感染
B.解除痉挛
C.消除炎症
D.稀释痰液
E.缓解缺氧
第4题
下列有关超声雾化吸入目的,不正确的叙述是
A.预防感染
B.解除痉挛
C.消除炎症
D.稀释痰液
E.缓解缺氧
第5题
下列有关超声雾化吸入的目的。不正确的叙述是()。
A.预防感染
B.解除痉挛
C.消除炎症
D.稀释痰液
E.缓解缺氧
第7题
超声雾化吸入地塞米松的作用是
A.控制呼吸道感染
B.解除支气管痉挛
C.稀化痰液,帮助祛痰
D.减轻呼吸道黏膜水肿
E.治疗肺癌
第8题
超声雾化吸入α-糜蛋白酶的作用是
A.控制呼吸道感染
B.解除支气管痉挛
C.稀化痰液,帮助祛痰
D.减轻呼吸道黏膜水肿
E.治疗肺癌
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