一种元素的同位素,他们的( ) A.中子数一定不相同 B.质子数一定不相同 C.

题型:选择题

问题:

一种元素的同位素,他们的(  )

A.中子数一定不相同

B.质子数一定不相同

C.原子序数一定不相同

D.核外电子数一定不相同

考点:原子的核式结构模型:α粒子散射实验
题型:选择题

据史书记载,春秋初年有一百多个诸侯国,到战国时期只剩下十几个了,这个材料反映的历史发展趋势是[ ]

A.诸侯国割据混战日益扩大

B.人民遭受的灾难更重

C.封建制度正逐步确立

D.历史向统一的方向发展

题型:选择题

监理评标除遵循客观、公平、公正、科学的最基本原则外,还应充分体现监理招标的特点,突出对投标人能力的评比,一般可选择的评标因素有______。

A.监理业绩与经验

B.监理人员配备

C.监理单位资质

D.监理试验或检测设备、仪器和工具是否能满足工程要求

E.监理费报价

题型:选择题

作为报关服务市场的主要管理力量,报关行业协会是海关与企业沟通的桥梁。 ( )

题型:选择题

在零件是自制还是外购决策中,若成本平衡点为10000件时,选择外购方案的条件是,全年零售量()。

A.小于10000件

B.不少于10000件

C.等于10000件

D.大于10000件

题型:选择题

Largely for "spiritual reasons", Nancy Manos started home-schooling her children five years ago and has studiously avoided public schools ever since. Yet last week, she was enthusiastically enrolling her 8-year-old daughter, Olivia, in sign language and modern dance classes at Eagleridge Enrichment—a program run by the Mesa, Ariz. , public schools and taught by district teachers. Manos still wants to handle the basics, but likes that Eagleridge offers the extras, "things I couldn’t teach. " One doubt, though, lingers in her mind. why would the public school system want to offer home-school families anything

A big part of the answer is economics. The number of home-schooled kids nationwide has risen to as many as 1.9 million from an estimated 345,000 in 1994, and school districts that get state and local dollars per child are beginning to suffer. In Maricopa County, which includes Mesa, the number of home-schooled kids has more than doubled during that period to 7,526, at about $ 4,500 a child, that’s nearly $ 34 million a year in lost revenue.

Not everyone’s happy with these innovations. Some states have taken the opposite tack. Like about half the states, West Virginia refuses to allow home-schooled kids to play public-school sports. And in Arizona, some complain that their tax dollars are being used to create programs for families who, essentially, eschew participation in public life. "That makes my teeth grit," says Daphne Atkeson, whose 10-year-old son attends public school in Paradise Valley. Even some committed home-schoolers question the new programs, given their central irony., they turn home-schoolers into public-school students, says Bob Parsons, president of the Alaska Private and Home Educators Association. "We’ve lost about one third of our members to those programs. They’re so enticing. "

Mesa started Eagleridge four years ago, when it saw how much money it was losing from home schoolers—and how unprepared some students were when they re-entered the schools. Since it began, the program’s enrollment has nearly doubled to 397, and last year the district moved Eagleridge to a strip mall (between a pizza joint and a laser-tag arcade). Parents typically drop off their kids once a week; because most of the children qualify as quarter-time students, the district collects $ 911 per child. "It’s like getting a taste of what real school is like," says 10-year-old Chad Lucas, who’s learning computer animation and creative writing.

Other school districts are also experimenting with novel ways to court home schoolers. The town of Galena, Alaska, (pop. 600) has just 178 students. But in 1997, its school administrators figured they could reach beyond their borders. Under the program, the district gives home-schooling families free computers and Internet service for correspondence classes. In return, the district gets $ 3,100 per student enrolled in the program—$ 9.6 million a year, which it has used partly for a new vocational school. Such alternatives just might appeal to other districts. Ernest Felty, head of Hardin County schools in southern Illinois, has 10 home-schooled pupils. That may not sound like much— except that he has a staff of 68, and at $ 4,500 a child, "that’s probably a teacher’s salary," Fehy says. With the right robotics or art class, though, he could take the home out of home schooling.

In the opening paragraph, the author introduces his topic by()

A. posing a contrast

B. justifying an assumption

C. explaining a phenomenon

D.making a comparison

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