道路交通事故

医师用拔牙钳先后拔除上颌中切牙和侧切牙时，发现他在同样施用旋转的方式，而且拔牙钳安放位置正确。施力的大小和速度基本一致情况下，侧切牙牙根尖1/3折断在牙槽窝内，分析其原因最有可能的是

A．侧切牙的牙根比中切牙的牙根更易折断

B．侧切牙牙根尖1/3常有弯曲，施用旋转力拔除时较易折断

C．拔除侧切牙时，旋转力施用不够

D．与拔除中切牙和侧切牙的先后顺序有关

E．以上都不是

根据牙松动的方向确定Ⅲ度牙松动是

A．颊舌向松动

B．近、远中向松动

C．垂直向松动

D．颊舌向和近、远中向松动

E．颊舌向、近远中向和垂直向松动

下列关于延安整风的表述，正确的是（）

A.在思想上清算了“左”的和右的错误 

B.是马克思主义思想教育运动 

C.为新民主主义革命在全国的胜利奠定了思想基础 

D.提高了广大党员的思想理论水平，增强了党的凝聚力和战斗力 

( )是我国应对未来挑战的重大选择。

A．推进科技体制改革

B．建设环境友好型社会

C．增强自主创新能力

D．培养高水平创新人才

Motivation is "the driving force within individuals that impels them to action." And goals are the sought-after results (1) motivated behavior.
Motivation can be either positive or negative (2) direction. We may feel a driving force toward some object or condition, (3) a driving force away from some object or condition. For example, a person may be impelled toward a restaurant to fulfill a need, hunger, and away (4) an airplane to fulfill a need of safety. Some psychologists refer to positive drives (5) needs, wants or desires, (6) negative drives as fears or aversions (7) , though negative and positive motivational forces seem to differ dramatically (8) terms of physical and sometimes emotional activity, they are basically similar in (9) they both serve to initiate and sustain human behavior. (10) this reason, researchers often refer (11) both kinds of drives or motives as needs, wants and desires.
Goals, (12) , can be either positive or negative. A positive goal is one toward (13) behavior is directed and it is often referred to as an approach object. A negative goal is (14) from which behavior is directed away and it is sometimes referred to as an avoidance object. Since both approach and avoidance goals can be considered objectives of motivated behavior, most researchers refer to (15) types simply as goals. Consider this example. A middle-aged woman may wish to remain (16) attractive as possible. Her positive goal is to appear desirable, and (17) she may use a perfume advertised to make her irresistible. A negative goal may be to prevent her skin (18) aging, and therefore she may buy and use face creams. (19) the former case, she uses perfume to help her achieve her positive goal -- attractiveness; in the (20) case, she uses face creams to help avoid a negative goal -- wrinkled skin.