(2014·苏锡常镇四市调研)—As a teenager，our son should have two or three hobbies to be really happy.—________，

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• 植物叶片与外界环境之间进行气体交换的门户是[]A．气孔B．角质层C．表皮D．保卫细胞-七年级生物
• 关于叶片的结构和功能特点正确的是[]A．植物叶片上的气孔都分布在下表皮B．植物的蒸腾作用能促进植物体从土壤中吸收水分和无机盐C．夏日的正午蒸腾作用减弱，主要原因是保卫细胞-八年级生物
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• (2013·高考陕西卷)Let those in need________that we will go all out to help them.A．to understandB．understan
• 读图回答下列问题：（1）植物蒸腾作用的主要器官是__________。（2）图中③是________，有输导和支持的作用，⑥是________，它是气体交换的窗口。（3）⑧是__________，内含
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• 绿色植物叶片的主要功能是[]A．吸收水分，运输有机物B．制造有机物，蒸腾水分C．贮藏有机物，产生二氧化碳D．运输有机物和无机盐-七年级生物
• Our neighbor has ________ ours.A．as a big house asB．as big a house asC．the same big house asD．a hous
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• 叶脉是叶片的“________”，有________作用，其内还有________和________（输送有机养料），因此，叶脉还有________作用。-七年级生物
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