题目

研究表明，当番茄叶片受到害虫损伤后，番茄细胞会迅速产生蛋白酶抑制剂，使害虫不能消化蛋白质而死亡，从而起到保护自身的作用．番茄的这种自我保护方式与与下列人体内生理功能最相似的是（ ） A．激素调节     B．神经调节     C．体液免疫     D．细胞免疫 答案：解：体液免疫是依靠效应B细胞产生抗体达到保护目的免疫机制，与“番茄细胞会迅速产生蛋白酶抑制剂，使害虫不能消化蛋白质而死亡”的自我保护方式类似． 故选C．A poor farmer had a  friend who was famous for the wonderful apple trees he grew. One day,  his friend gave the farmer a young apple tree and told him to plant it.  The farmer was pleased with the gift, but he did not know where to plant it. He was afraid that if he planted the tree near the road,  strangers would steal the fruit.  If he planted the tree in one of his fields,  his neighbors would come at night and steal some of the apples.  If he planted the tree near his house, his children would take the fruit.  Finally he planted the tree in his wood.  But without sunlight and good soil(土壤), the tree soon died. Later the friend asked the farmer why he had planted the tree in such a poor place.  “What’s the difference? ” the farmer said angrily and then told what he had thought. “Yes, ” said the friend,  “but at least someone could have enjoyed the fruit.  Now you not only have robbed everyone of the fruit, but also you have destroyed (毁掉) a good apple tree! ” 1.What gift did the farmer get from his friend one day? ___________________________________________________________ 2.How many people are there in the story? ____________________________________________________________ 3.Where did the farmer plant the apple tree at last? ____________________________________________________________ 4.Why did the apple tree soon die? ____________________________________________________________ 5.Who destroyed the apple tree? ____________________________________________________________