第Ⅱ卷(非选择题 共35分)
第四部分写作(共二节，满分35分)
第一节对话填空（共10小题；每小题1分，满分10分）
阅读下面对话，掌握其大意，并根据所给的字母的提示，在标有题号的横线上写出一个英语单词的完整、正确形式，使对话通顺
Here is a conversation between a baby snail and his mother, which 76.t______ me deeply.
Baby snail: “Why was I born with a 77.s______ that grew so hard and so heavy?”
Mother snail: “Because we do not have bones to 78.s______ us. We can only crawl and move 79.s______, so we get a shell to protect us.”
Baby snail: “The caterpillar（毛虫）has no bones either, nor can she move quickly. Why can she go without a shell?”
Mother snail: “That’s because a caterpillar will become a 80.b_______. She can fly high to sky, and the sky can protect her.”
Baby snail: “But the earthworm（蚯蚓）81.c______ like us. He has no bones, nor can he turn into a butterfly. Why does he not 82.c______ a hard and heavy shell?”
Mother snail: “He can drill a hole into the ground to protect himself.”
Baby snail: (Bursting into tears) “What a 83.p______! We have no 84.p______ from either the sky or the ground.”
Mother snail: “That’s why we are 85.g______ with a shell. We don’t need to depend on the sky or the ground for protection. We depend on ourselves.”
分别表示N2、H2、NH3。图⑤表示生成的NH3离开催化剂表面，图②和图③的含义分别是__________________、__________________。 
7N2+12H2O（NO 也有类似的反应）
