质量特性是指（）与要求有关的固有特性。 A.产品 B.顾客 C.体系 D

有极昼和极夜的地区是（　　）

A．南北回归线之间的热带地区

B．回归线至极圈之间的温带地区

C．北极圈以北和南极圈以南的寒带地区

D．赤道附近地区

三位数乘三位数，积可能是______位数或______位数．

下列实验方案或措施合理的是（ ）

A．除去CaO中混有的CaCO₃，先加足量的水，然后过滤

B．除去MnO₂粉末中混有的KCl，加足量的水溶解、过滤、洗涤、干燥

C．用无色酚酞溶液检验氢氧化钠溶液是否变质

D．用碘化钾溶液检验食品中是否含有淀粉

目前国际货币主要为美元，此外还有：（）。

A、马克

B、日元

C、英镑

D、泰铢

E、欧元

Seventeen-year-old Quantae Williams doesn’t understand why the U. S. Supreme Court struck down his school district’s racial diversity program. He now (61) the prospect of leaving his mixed-race high school in suburban Louisville and (62) to the poor black downtown schools where he (63) in fights. "I’m doing (64) in town. They should just leave it the (65) it is," said Williams, using a fond nickname for suburban Jeffersontown High School, (66) he’s bused every day from his downtown neighborhood. "Everything is (67) , we get along well. If I go where all my friends go, I’ll start getting in trouble again," Williams said as he took a (68) from his summer job (69) clothing (70) for poor families.

Last month’s 5-4 ruling by the Supreme Court struck down programs that were started voluntarily in Louisville and Seattle. The court’s decision has left schools (71) the country (72) to find a way to protect (73) in their classrooms. Critics have called the decision the biggest (74) to the ideals of the 1954 Brown vs. Board of Education (75) , which outlawed racial segregation in U. S. public schools. With students already (76) to schools for the (77) year that begins in September, (78) will be immediately affected by the Supreme Court decision. In Jefferson County, officials said it could be two years (79) a new plan is (80) place, leaving most students in their current schools.

75（）

A.academic

B.scholarly

C.educational

D.pedagogical