儿科染色体病中最常见的是（） A.18-三体综合征 B.猫叫综合征 C.先天性心脏病 发布时间：2020-02-13 23:41 │ 来源：www.tikuol.com 题型：单项选择题 A1/A2型题 问题： 儿科染色体病中最常见的是（）A.18-三体综合征B.猫叫综合征C.先天性心脏病D.21-三体综合征E.脆性X染色体综合征
题型：单项选择题 A1/A2型题 完型填空。 Home Alone It was Sunday afternoon. My brother and I were alone at home. My parents went for a party and asked meto look after my brother. I was doing my homework while my younger brother was watching TV. Suddenly thedoorbell rang. Ding-Dong! My brother thought that it was our parents, so he opened the 1 quickly. A tall man wearing a black raincoat stood outside. He said that he came to sell books and he 2 politely:"Are your parents at home?" Without thinking, my brother said, "No." Then the man asked: "Would you like to 3 some story books?"I told him we didn't want to buy. When I wanted to close the door, he suddenly pushed (推) the door very 4 and came into our house. He took out a 5 and ordered me to tie (绑) up my brother's hands with a rope (绳子). I tied up his hands in a special way so my brother could untie 6 easily. The man then tied my handsup and locked 7 of us in the kitchen. Soon, he went upstairs to 8 money. I taught my brother to untie therope on his 9 . He then untied me. I rushed to the telephone to call the police, 10 the line was dead. The doors were all locked from the outside. It was lucky that the man 11 to lock the kitchen window. So we got out of the house through the kitchen window and went to the 12 pay phone to call the police. Soon 13 came to our house and the man was caught by the police. By that time, my parents had comehome. We told them the whole story. My parents were 14 that we were not hurt. They told me that we shouldn't 15 the door to strangers. I learnt a lesson on safety. ( ) 1. A. window ( ) 2. A. asked ( ) 3. A. lend ( ) 4. A. politely ( ) 5. A. kiss ( ) 6. A. himself ( ) 7. A. most ( ) 8. A. look at ( ) 9. A. feet ( ) 10. A. and ( ) 11. A. wanted ( ) 12. A. farthest ( ) 13. A. my friends ( ) 14. A. happy ( ) 15. A. clean B. door B. ask B. borrow B. slowly B. knife B. itself B. some B. look after B. hands B. so B. liked B. nearest B. the police B. angry B. close C. book C. answered C. sell C. heavily C. gift C. herself C. both C. look like C. mouth C. or C. forgot C. largest C. the neighbors C. sad C. lock D. TV D. answer D. buy D. happily D. pen D. themselves D. all D. look for D. legs D. but D. tried D. smallest D. my parents D. tired D. open 查看答案
题型：单项选择题 A1/A2型题 1990年8月，某远洋客轮上发生一起军团病暴发流行。船离开港口时载有350名乘客、50名船员。8月1日前的一周内，在次风暴中有1/7的乘客遇难。8月份第一周中，船上有30人发生军团病，其中一半很快死亡。随后的一周内又有20人发病，但无死亡。假设症状持续一个月。8月7日（8月份第一周的最后一天）军团病的患病率是（）A.0.045B.0.075C.0.143D.用该资料不能计算E.以上答案均不是 查看答案