急性呼吸窘迫综合征(ARDS)发生的常见原因是（） A.消化道出血 B.肺感染 C.

前核间型眼肌麻痹

肠扭转最多见于 （）

A.饥饿时运动

B.饱食后卧床

C.饱食后剧烈活动

D.腹部曾有创伤

E.腹内曾有手术

When I was young, my parents ran a snack bar in our small town.One evening in early April, my mother told me to fill in at the snack bar (1) a worker who had the flu. I told her I would mess it up, (2) I had never worked at the bar before. I (3) that instead of making money, I would end up owing it."You can do it," said my mother," (4) , you won’t get much business until lunch. ""But I’ll never remember the orders, and I’m no good (5) money. Please, Mom, don’t (6) me."Then I’ll help you", she said.I shrugged my shoulders. I thought my mother’s (7) was a bad one, but I (8) .When I got to the bar the next day, I found my mother was (9) . Because the weather that day was rainy and cold, people wanted hot snacks and drinks. (10) , I was really slow at taking the orders and making change. The line of people grew, and everybody seemed (11) , I was so nervous that my hands shook, and I (12) a cup into pieces. What a mess! Then my mother came to (13) me, and she also showed me how to make (14) . If someone gave me $ 5 for something that cost $ 3.25, I handed over (15) quarters and a dollar and said, "75 cents makes four dollars, plus one dollar makes five. " Things went more (16) after that.By the end of the day, I could remember orders, (17) the bill, and make change quickly with a smile. I was even a little (18) when the sun came out and dried up business. My mother said she was proud of me, and when she (19) that I work at the snack bar again next year, I did not even shrug. I was too busy (20) the restaurant I would open one day.

第（2）空应选择（）

A．because

B．though

C．until

D．while

某校课外兴趣小组对一批粗锌样品进行分析

（1）他们先将100g质量分数为98%的硫酸稀释成19.6%的稀硫酸，需加水                      g；

（2）实验测得：15g粗锌和100g溶质质量分数为19.6%的稀硫酸恰好完全反应（粗锌中所含杂质不溶于水，也不参与反应），

请你计算： ①15g粗锌的中锌的质量

                   ②恰好完全反应时所得溶液的溶质质量分数（计算结果保留到0.1％）

胞宫的主要生理功能是（）

A.主月经

B.主带下

C.主孕育胎儿

D.主月经和孕育胎儿

E.主经、带、胎、产