酸、碱、盐及其反应的有关知识与人们的生活和生产有着密切的关系．（1）胃酸的主要

发布时间：2017-07-04 08:20 │ 来源：www.tikuol.com

题型：问答题

问题：

酸、碱、盐及其反应的有关知识与人们的生活和生产有着密切的关系．

（1）胃酸的主要成分是稀盐酸，它能促进胃蛋白酶的作用，使之容易被人体吸收等，但胃酸过多会引起胃痛．服用含有氢氧化镁的药物可缓解这种病痛，其反应的化学方程式为______．

（2）做馒头时，面团经过发酵会生成一些酸，当加入适量的纯碱溶液后，它们会相互作用产生______气体，使蒸出的馒头疏松多孔．

（3）下表是某些农作物生长最适宜的pH范围：

农作物	小麦	玉米	大豆	柑橘
pH	6.2～7.5	6.5～7.5	6.5～7.5	5.0～6.5

我市有些地方的土壤呈弱碱性，你认为该地区最不适宜种植的农作物是______．

A．小麦 B．玉米 C．大豆 D．柑橘．

完形填空
Spend a pound to win a penny Some people were steaming peas under a tree in order to make a meal for their horses. Up in the branches sat a monkey,__1__what they were doing. "Aha" thought the monkey. "I spot my 2_ !" So when the men had finished steaming the peas and __3__ for a moment to look after the horses,__4__,the monkey let himself down from the tree. He snatched (抓) the peas and filled his__5__and both hands as full as they could__6__. Then he climbed up the tree and sat there, eating happily. Suddenly one pea fell. "Oh dear! Oh my pea!" cried the monkey. The other peas__7__to drop out of his mouth. He__8__his hands in despair(绝望地), and the peas fell out of his hands too, but he took on__9__. All he thought of was that one pea was gone,__10__ he climbed down the trunk to hunt for his lost pea on the ground. At this time, the men came back. When they saw a monkey__11__with their pots, they all__12__their arms and shouted, "Shoo! Shoo!" Then they picked up stones and began to __13__the monkey with them. The monkey was so__14__that he gave one jump to the nearest__15__ , and swung himself up to the top of the tree. "After all," said he to himself, "it was__16__ one pea." But he ought to have thought of that __17__, for now all the other peas had gone too. That day the monkey had to content himself with the__18__ of boiled peas for dinner, and I hope the __19__ taught him not to be so__20__in future.
( )1. A. watching ( )2. A. shelter ( )3. A. turned up ( )4. A. easily ( )5. A. bowl ( )6. A. receive ( )7. A. seemed ( )8. A. crossed ( )9. A. interest ( )10. A. so ( )11. A. helping ( )12. A. carried ( )13. A. attack ( )14. A puzzled ( )15. A. branch ( )16. A. still ( )17. A. earlier ( )18. A. image ( )19. A. trick ( )20. A. curious	B. enjoying B. neighbors B. turned away B. gently B. pocket B. hold B. began B. hid B. time B. because B. playing B. broke B. separate B. disappointed B. stone B. even B. sooner B. smell B. disaster B. ambitious	C. describing C. dinner C. gave up C. safely C. mouth C. support C. hurried C. touched C. notice C. although C. mixing C. waved C. destroy C. terrified C. pea C. only C. longer C. dream C. loss C. proud	D. guessing D. friends D. gave away D. confidently D. bag D. put D. failed D. squeezed D. sign D. if D. dealing D. bent D. bother D. annoyed D. horse D. almost D. later D. taste D. process D. greedy

酸、碱、盐及其反应的有关知识与人们的生活和生产有着密切的关系． （1）胃酸的主要

问题：

酸、碱、盐及其反应的有关知识与人们的生活和生产有着密切的关系．（1）胃酸的主要