题目

2011年是国际化学年，主题为“化学﹣﹣人类的生活，人类的未来”．生活中处处有化学．请根据相关的化学知识回答下列问题． （1） 有些青少年不爱吃蔬菜、水果，一定程度上会影响生长发育，蔬菜、水果中富含的营养素是． （2） 最近，美国科学家用废鸡毛制造出一种生物可降解塑料．用废鸡毛制成的塑料属于（填“物理”或“化学”）变化，塑料属于（填“天然”或“合成”）有机高分子材料． （3） 盐类物质的用途很广．完形填空。Long long ago, there ______ a poor man. He had ______ orange tree in his garden. ______ the tree there were many fine oranges. One day he ______ one of his oranges was much bigger than ______. The poor man ______ the orange to the king. The king ______ very happy. He gave the poor man ______ money. A rich man heard of it. He said to himself, “It’s only an orange. Why did the king give so much money for it? I’ll ______ my gold cup to the king. He’ll give me more money.”The next day, when the king got the gold cup, he said to the rich man, “______ a beautiful cup! I’ll show you something wonderful. Please take this orange.”【1】A.isB.areC.was【2】A.anB./C.a【3】A.OnB.InC.At【4】A.findB.foundC.finds【5】A.anotherB.the othersC.the other【6】A.takeB.takesC.took【7】A.wasB.wereC.is【8】A.manyB.a lotC.a lot of【9】A.takeB.tookC.takes【10】A.WhatB.HowC./