动物的下列行为属于学习行为的是（ ） A．鹦鹉学舌 B．燕子迁徙 C．飞蛾扑火

若直线l₁：ax+2y=0和l₂：3x+（a+1）y+1=0平行，则实数a的值为______．

In my living room, there is a plaque (匾) that advises me to “Bloom (开花) where you are planted.” It reminds me of Dorothy. I got to know Dorothy in the early 1980s, when I was teaching Early Childhood Development through a program with Union College in Barbourville, Kentucky. The job responsibilities required occasional visits to the classroom of each teacher in the program. Dorothy stands out in my memory as one who “bloomed” in her remote area.

Dorothy taught in a school In Harlan County, Kentucky, Appalachian Mountain area. To get to her school from the town of Harlan, I followed a road winding around the mountain. In the eight-mile journey, I crossed the same railroad track five times, giving the possibility of getting caught by the same train five times. Rather than feeling excited by this drive through the mountains, I found it depressing. The poverty level was shocking and the small shabby houses gave me the greatest feeling of hopelessness.

From the moment of my arrival at the little school, all gloom (忧郁) disappeared. Upon arriving at Dorothy’s classroom. I was greeted with smiling faces and treated like a queen. The children had been prepared to show me their latest projects. Dorothy told me with a big smile that they were serving poke greens salad and cornbread for “dinner” (lunch). In case you don’t know, poke greens are a weed-type plant that grows wild, especially on poor ground.

Dorothy never ran out of reports of exciting activities of her students. Her enthusiasm never cooled down. When it came time to sit for the testing and interviewing required to receive her Child Development Associate Certification, Dorothy was ready. She came to the assessment and passed in all areas. Afterward, she invited me to the one-and-only steak house in the area to celebrate her victory, as if she had received her Ph. D. degree. After the meal, she placed a little box containing an old pen in my hand. She said it was a family heirloom (传 * * ), but to me it is a treasured symbol of appreciation and pride that cannot be matched with things. (360 words)

小题1:“Early Childhood Development” in Paragraph 1 refers to __________.

A．a program directed by Dorothy

B．a course given by the author

C．an activity held by the students

D．an organization sponsored by Union college小题2: In the journey, the author was most disappointed at seeing __________.

A．the long track

B．the poor houses

C．the same train

D．the winding road小题3:Upon arriving at the classroom, the author was cheered up by __________.

A．a warm welcome

B．the sight of poke greens

C．Dorothy’s latest projects

D．a big dinner made for her小题4:What can we know about Dorothy from the last paragraph?

A. She was invited to a celebration at a restaurant.

B. She got a pen as a gift from the author.

C. She passed the required assessment.

D. She received her Ph. D. degree.

小题5:What does the author mainly intend to tell us?

A．Whatever you do, you must do it carefully.

B．Whoever you are, you deserve equal treatment.

C．However poor you are, you have the right to education,

D．Wherever you are, you can accomplish your achievement.

关于黑素细胞正确的是（）

A.圆形细胞

B.来源于神经嵴

C.有桥粒

D.有角蛋白

E.不与角质形成细胞接触

《建筑起重机械备案登记办法》要求：建筑起重机械使用单位在建筑起重机械安装验收合格之日起（）日内，向工程所在地县级以上地方人民政府建设主管部门办理使用登记。

A.10

B.15

C.20

D.30

下列恶性肿瘤组织中FDG代谢较高是（）。

A.印戒细胞癌

B.粘液腺癌

C.透明细胞癌

D.白血病细胞

E.淋巴瘤细胞