在数据库系统的体系结构中，通过改变______映像可以实现数据库的物理数据独立性。

王肖(男)与柳玉(女)于1989年结婚，婚后二人感情不和，常为琐事争吵。柳玉多次与王肖协商离婚，均因财产处理问题无法达成一致而未成。1999年3月柳玉向法院提起诉讼，要求解除与王肖的婚姻关系。如果法院审理该案的过程中发现柳玉怀孕已3个月，法院应当如何处理()

A．作出驳回起诉裁定

B．应当判决不准许离婚

C．中止诉讼，待柳玉分娩后1年再继续审理

D．可以继续审理

信用证的种类中，（）也称红条款信用证。

A．预支信用证

B．对开信用证

C．背对背信用证

D．备用信用证

有Na₂CO₃，Ba(OH)₂，H₂SO₄三种体积和物质的量浓度都相等的溶液，几位同学按不同的顺序将它们混合(产生沉淀立即过滤掉)，对于所得溶液，下列结论正确的是[ ]

A．溶液一定显碱性　 　　　　　　

B．溶液不可能显碱性　

C．溶液可能显碱性　 　　　　　　

D．溶液不可能显酸性

依据《水污染防治法》，禁止向水体排放的是（）。

A．酸液

B．含热废水

C．碱液

D．含病原体的污水

E．剧毒废液

Part 2

Questions 9-18

·Read the following passage and answer questions 9-18.
1. When Christopher Columbus landed on America’s shores, he encountered copper-shinned people whom he promptly called "Indians". Current estimates indicate that there were over a million Indians inhabiting North American then. There are approximately 800,000 Indians today, of whom about 250, 000 live on reservations.
2. The early settlers had an amicable relationship with Indians, who shared their knowledge about hunting, fishing, and farming with their uninvited guests. The stereotyped stealthy, wicked Indian of western movies are created by different faithless white man; the Indian was born friendly.
3. Disgust developed between the Indians and the settlers, whose encroachment on Indian lands provoked an era of turbulence. As early as 1745, Indian tribes joined together to drive the French off their land. The French and Indian war did not end until 1763. The Indian had succeeded in destroying most of the settlements. The British, superficially submissive to the Indiana, promised that further migrations west would not extend beyond a specified boundary.
4. Vacated from their lands or, worse still, frankly giving their property to the whites for few baubles, Indians were ruthlessly pushed west. The battle in 1876 at Little Horn river in Montana, in which setting Bull and the Sioux tribes massacred General Custer’s cavalry, caused the whites intensify their campaign against the Redman. The battle at Wound Knee, South Dakota, in 1890 put an end to the last vestige of hope for amity between Indians and whites.
5. Although the Bureau of lndian affairs has operated since 1842, presumably for the purpose of guarding Indians "interests", Indian on reservations lead notoriously deprived lives. In recent times Indians have taken a militant stand and appealed to the courts and the American people to improve their substandard living conditions.

Questions 9-13

·For questions 9-13, choose the best title for each paragraph from below.
·For each numberedparagraph (1-5), mark one letter (A-G) on the Answer Sheet.
·Do not mark any letter twice.
9. Paragraph 1: ______

• A. Indians, once the master of America, now live in their
  reservation.
  10. Paragraph 2: ______
• B. Indians were pushed away.
  11. Paragraph 3: ______
• C. The wars between Indian and the settlers.
  12. Paragraph 4: ______
• D. Indians arestill fighting for the improvement of their lives.
  13. Paragraph 5: ______
• E. The relationship between Indians and the early settlers.
• F. Indians were ferocious savages.
• G. Indian’s struggle for their own possessions.