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一般为乳白色，或灰、黑等色，无色透明者称冰洲石，具显著的重折射现象，硬度3，比重2.71。遇稀盐酸产生气泡

单项选择题共用题干题

患者女，26岁，因外伤冠折，要求修复，查见残根，断面在牙槽嵴以上，已行根管治疗术，无松动，无叩痛，余留牙正常。

若为患者设计桩核烤瓷冠修复，根面制备时下述哪一项不正确（）。

A.根面制备成唇舌向的两个斜面

B.唇舌斜面相交线应该偏向根管口舌侧

C.当不可能制备出两个斜面时，可以制备成平面或者凹面

D.唇侧斜面可制备成凹斜面

E.通常应该在颈部做出肩台

完形填空

Mark Twain said that “habit is habit, and not to be flung(扔) out the window by anyone, but coaxed (劝诱)downstairs a step at a time.” The chances of successfully changing negative behavior        when you make gradual changes that give you time to        negative patterns for positive ones.
On any given day, countless numbers of us get out of bed and        to begin to change a given behavior “today.” Whether it be exercising more, drinking less, managing time        or some other change in a negative behavior, we start out with high       . In a short time, however, a vast majority of people fail and are soon doing        it was they thought they shouldn't be doing.
After considerable research, some researchers believe that behavior changes usually do not        if they start with the change itself.       , they believe that we must        a series of “stages” to adequately prepare ourselves for that        change. Once you have analyzed all the factors that        what you do, you must decide which behavior-change technique will work best for you.
According to the psychologist Albert Ellis, most        problems and related behaviors arise from irrational (不理性的) statements that people make to        when events in their lives are different from what they would like them to be. For example, suppose alter doing        on an exam, you say to yourself, “I can't believe I failed that easy exam, I’m so stupid.” By changing this irrational “catastrophic” self-talk into rational,        statements about what is really going on, you can increase the        that positive behaviors will occur.
Positive self-talk might be        as follows: “I really didn’t study enough for the exam. I just need to prepare for the next       .”
Such self-talk will help you to recover quickly from        and take positive steps to correct the situation. Some other technique like purposefully        or stopping negative thoughts and refusing to dwell on(沉湎于) negative images can also spare you wasted energy, time and emotional resources and move on to positive changes.

B．requirements

C．expectations

A．Nevertheless

A．look through

B．break through

D．pull through

D．professional

D．probability

C．disappointment