牙体缺损修复时,增加抗力形的措施,除了
A. 消除薄壁弱尖
B. 消除无基釉柱
C. 尽量保护牙髓
D. 均匀分散力
E. 选用理化性能好的材料
According to psychologists, an emotion is aroused when a man or an animal views something as either bad or good, When a person feels like running away from something he thinks will hurt himself, we call this emotion fear. If the person wants to remove the danger by attacking it, we call the emotion anger. The emotions of joy and love are aroused when we think something that can help us. An emotion does not have to be created by something in the outside world. It can be created by a person’s thoughts.Everyone has emotions. Many psychologists believe that infants are born without emotions. They believe children learn emotions just as they learn to read and write. A growing child not only learns his emotions but also learns how to act in certain situations because of an emotion.Psychologists think that there are two types of emotions: positive and negative. Positive emotions include love, liking, joy, delight, and hope. They are aroused by something that appeals to a person. Negative emotions make a person unhappy or dissatisfied. They include anger, fear, despair, sadness, and disgust. In growing up, a person learns to cope with the negative emotions in order to be happy.Emotions may be weak or strong. Some strong emotions are so unpleasant that a person will try any means to escape from them. In order to feel happy, the person may choose unusual ways to avoid the emotion.Strong emotions can make it hard to think and to solve problems. They may prevent a person from learning or paying attention to what he is doing. For example, a student taking an examination may be so worried about failing that he cannot think properly. The worry drains valuable mental energy he needs for the examination. As used in the last sentence, the word "drains" means ().
A. stops
B. ties
C. weakens
D. flows gradually
The house and carriage is a thing of the past. but love and marriage are still with us and still closely interrelated. Most American marriages, (21) first marriages uniting young people, are the result of mutual attraction and affection (22) than practical considerations.In the United States, parents do not (23) marriages for their children. Teenagers begin dating in high school and usually find mates through their own academic and social (24) (25) young people feel free to choose their friends from (26) groups, most choose a mate of similar (27) This is due in part to parental guidance. Parents cannot (28) spouses (配偶) for their children, but they can usually (29) choices by voicing disapproval of someone they consider unsuitable.(30) , marriages between members of different groups (interclass, interfaith, and interracial marriages) are (31) , probably because of the greater mobility of today’s youth and the fact that they are (32) by fewer prejudices than their parents. Many young people leave their hometowns to attend college, serve in the armed forces, (33) pursue a career in a bigger city.Once away from home and family, they are more (34) to date and marry outside their own social group.In mobile American society, interclass marriages are neither (35) nor astonishing. Interfaith marriages are (36) the rise, especially between Protestants (基督教徒) and Catholics ( 天主徒). On the other hand, interracial marriages are still very (37) . It can be difficult for interracial couples to find a place to live, maintain friendships, and (38) a family. Marriages between people of different national (39) (but the same race and’ religion) have been commonplace here (40) colonial times. 36().
A. source
B. convention
C. origin
D. immigrant
含铝、镁的吸收性制酸药可以使与其合并应用的药物吸收减少疗效降低,下列哪种药的吸收减少,药效增加
A. 西咪替丁
B. 洋地黄苷类
C. 左旋多巴
D. 异烟肼
E. 脂溶性维生素