9x2﹣kxy+4y2是一个完全平方式，那么k的值是[ ] A．12 B．﹣12

下列选项中，属于社会工作者为居家老人所提供的健康促进与健康维护服务内容的是（）。

A.联系和安排送餐服务

B.健康风险评估档案

C.为老人开设家庭病床

D.为老人提供辅助器具

2010年4月美国墨西哥湾原油泄漏，污染了海洋。原油属于[ ]

A．单质

B．混合物

C．化合物

D．纯净物

Directions: For each blank in the following passage there are four words or phrases marked A,B,C and D. Fill in each blank with word or phrases that best fits the context.

“Everything happens for the best,” my mother said whenever I  36 disappointment. “If you can carry on, one day something good will happen. And you'll realize that it wouldn't have happened if not for that  37  disappointment.”

Mother was right, as I discovered after graduating from college in 1932.I had decided to try out a job in radio, then work my way up to sports  38  . I hitchhiked to Chicago and knocked on the door of every station and got turned down every time.

In one studio, a kind lady told me that big stations couldn’t risk hiring inexperienced person. “Go out in the sticks and find a small station that’ll give you a  39 ,”she said.

I thumbed home to Dixon, Illinois.  40  there was no radio-announcing jobs in Dixon, my father said Montgomery Ward had opened a store and wanted a local  41 to manage its sports department. Since Dixon was where I had played high school football, I  42 . The job sounded just right for me. But I wasn’t hired.

My disappointment must have  43 . “Everything happens for the best,” Mom reminded me. Dad offered me the car to job hunt. I tried WOC Radio in Davenport, Iowa. The program director, a wonderful Scotsman named Peter MacArthur, told me they had already hired an announcer.

As I left his office, my frustration  44 . I asked a1oud, “How can a fellow get to be a sport announcer if he can’t get a job in a radio station?”

I was waiting for the elevator when I heard MacArthur   45  . “What was that you said about sports? Do you know anything about football?” Then he stood me before a microphone and asked me to broadcast an  46  game.

On my way home, as I have many times since, I thought of my mother’s words. I often wonder what  47 my life might have taken if I’d gotten the job at Montgomery Ward.  

36. A. faced                       B. received                    C. considered             D. met

37. A. old                          B. previous                    C. early                    D. original

38. A. layer                        B. manager                    C. announcer             D. fan

39. A. job                          B. suggestion                 C. chance                  D. advantage

40. A. While                      B. When                        C. Which                   D. So

41. A. worker                     B. student                      C. announcer             D. athlete

42. A. accepted                   B. agreed                       C. applied                  D. promised

43. A. come                       B. shown                      C. disappeared           D. brightened

44. A. turned over               B. hit over                     C. boiled over            D. took over

45. A. murmuring               B. calling                      C. whispering            D. announcing

46. A. forceful                    B. close                         C. imaginary              D. ordinary

47. A. side                         B. action                       C. approach               D. direction

下列与船舶的横摇周期有关的因素是（）。

A．型宽B

B．船舶型深D

C．船舶型吃水

D．A、C均是

引起胰腺坏死是因首先（）

A．激活弹力纤维酶

B．激活磷脂酶A

C．激活胰舒血管素

D．激活胰蛋白酶

E．激活血浆激肽