已开具的发票存根联和发票登记簿，应该保存( )。A．3年B．5年C．10年D．永久

受到河流、山川自然地形、矿藏资源或交通干道的分割的城市，为了组织好生产和生活，应采取（）布局。

A.星状

B.格网状

C.带状

D.组团状

用天平和量筒测金属块的密度。将托盘天平放在水平台面上，在调节天平平衡的过程中，如果指针偏向分度盘中央刻线的右侧，应将天平平衡螺母向______ （选填“左”或“右”）调节．在调好的天平左盘放金属块，天平平衡时，砝码及游码在标尺上的位置如图甲所示，则金属块的质量是__________ g．把金属块放人装有适量水的量筒中，量筒内水面的位置如图乙所示，则金属块的密度是_________ kg／m³．金属块有磨损后，它的密度__________ （选填“变大”、“不变” 或“变小”）．

根据工程建设项目的经济效益、社会效益和市场需求等基本特性，进行建设项目分类中不包括( )。

A．竞争性项目

B．非竞争性项目

C．公益性项目

D．基础性项目

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.

8（）。

A. guessed

B. obeyed

C. begged

D. admitted

简述警察道德评价的途径。