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问题 多项选择题

下列说法正确的是()

A．牙槽骨吸收达3/5的患牙仍可以作为圆锥型套筒冠义齿的基牙

B．考虑到患者摘戴方便，除固位支持型基牙外，其余均作为需要缓冲的基牙

C．支持型基牙牙周组织必须健康

D．锥型牙，扭转牙不能选择固位支持型基牙

E．前牙也能作为支持固位型基牙

答案

参考答案：A, E

问答题

把硬币竖直上抛，在上升过程和下落过程，如图所示．请在图中画出硬币在上升过程和下落过程中所受到的力的示意图（忽略空气阻力）．
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单项选择题

A new study finds that blacks on death row (1) of killing whites are more likely to be executed than whites who kill minorities. It also concludes that blacks who kill (2) minorities are (3) likely to be executed than blacks who kill whites. For example, there is more than a twofold greater risk that an African-American who killed a white will be executed than a white person who kills a (4) victim. A Hispanic is at least 1.4 (5) more likely to be executed (6) such an offender kills a white.

The researchers of the study believe that there are two (7) explanations.. First, prosecutors often win (8) office if they win well-publicized cases. When a black kills a white, such killings gets more (9) and this idea can be (10) by many famous cases. (11) , the court judges at the state level are often (12) to elections, called retention elections. Retention election or judicial retention within the United States court system, is a periodic process, in which the voter (13) approval or disapproval for the judges presently (14) their position, and a judge can be removed from the position if the (15) of the citizens vote him or her out. Just as the researchers (16) out, death penalty is (17) political.

The findings of the study, in short, show that American justice systems clearly (18) white lives more than those of blacks or Hispanics. The researchers also say their findings (19) serious doubts about (20) that the U.S. criminal justice system is colorblind.

4（）

A.nonwhite

B.American

C.foreign

D.minor
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