题目

夏天，用橡皮膜封闭一锥形瓶的瓶口，把锥形瓶放在冰水中后，瓶口的橡皮膜会向下凹，如图所示，由此可知：该瓶内气体温度降低，质量_______（选填“变大”、“不变”或“变小），体积_______（选填“变大”、“不变”或“变小”），密度_______（选填“变大”、“不变”或“变小”）。根据气体密度的这种变化规律，发生火灾时为了避免吸入燃烧后产生的有毒气体，人应尽量_______（选填“贴地爬行”或“直立行走”）。阅读理解。Dear World,     My son starts school today. It’s going to be strange and new to him for some time. And I wish you would treat him gently.     You see, up to now, he has been the king of his own room. He has been the boss of the backyard. I have always been around to treat his wounds* and to comfort* his feelings.     But now things are going to be different. This morning, he’s going to walk down the front steps, wave his hand and start on his great adventure*.     So, World, I wish you would take him by the little hand and teach him the things he will have to know.     Teach him there are heroes, leaders and friends in this world. Give him quiet time to think over the mystery of birds in the sky, clouds in the sun and flowers on the green hill.     Teach him to believe in his own ideas, even id everyone else tells him they are wrong.     Teach him to stand and fight if he thinks he is right.     Teach him never to put a price on his heart and soul*.     Teach him gently, World, but don’t coddle* him, because only the test of fire makes fine steel. This is a big order, World, and see what you can do. He’s such a little fellow*.                                                                                                                                                 Mother 1. From the second paragraph we know that the writer’s son _______.A. is often ill B. is smartC. has been working at homeD. has been taken good care of at home2. The writer wishes her son _______.A. to treat others gentlyB. not to feel strange at schoolC. to develop* some good habits D. to be better than other children at school3. What does the writer wish her son to do when someone says he is wrong?A. He should not give up his idea easily.B. He should listen to others and change his idea.C. He should ask the people around for advice.D. He should ask her what to do.4. From the passage, we know the writer _______.A. is not worried about her son at allB. is excited about her son’s going to schoolC. writes his passage to other parentsD. doesn’t want her son to go to school5. Which is the best title of this passage?A. My Son Is Great B. How To Teach My SonC. A Mother’s Letter To The World D. Don’t Be Rude To My Son