问题 单项选择题 A1型题

与圆环形卡环臂相比,杆形卡环臂的缺点是()。

A.不美观

B.强度差

C.固位作用差

D.稳定作用差

E.制作难度大

答案

参考答案:D

解析:本题考查考生对圆环形卡环与杆形卡环差别的了解。杆形卡环臂和圆环形卡环臂相比,其进入基牙固位倒凹的方向和与基牙接触面积不同,暴露金属少,更美观,但稳定作用差。两者的固位作用效果、强度和制作难度均无差别。正确答案应为D。

阅读理解

Some children are natural-born bosses. They have a strong need to make decisions,manage their environment,and lead rather than follow. Stephen Jackson,a Year One student,“operates under the theory of what's mine is mine and what's yours is mine,” says his mother. “The other day I bought two new Star Wars light sabers (剑). Later,I saw Stephen with the two new ones while his brother was using the beat-up ones.”

“Examine the extended family,and you'll probably find a bossy grandparent,aunt,uncle or cousin in every generation. It's an inheritable trait,” says Russell Barkley,a professor at the Medical University of South Carolina. Other children who may not be particularly bossy can gradually gain dominance (支配地位) when they sense their parents are weak,hesitant,or in disagreement with each other.

Whether it's inborn nature or developed character at work,too much control in the hands of the young isn't healthy for children or the family. Fear is at the root of a lot of bossy behavior,says family psychologist John Taylor. Children,he says in his book From Defiance to Cooperation,“have secret feelings of weakness” and “a desire to feel safe.” It's the parents' role to provide that protection.

When a “boss child” doesn't learn limits at home,the stage is set for a host of troubles outside the family. The overly willful and unbending child may have trouble obeying teachers or coaches,for example,or trouble keeping friends. It can be pretty lonely as the top dog if no one likes your bossy ways.

“I see more and more parents giving up their power,” says Barkley,who has studied bossy behavior for more than 30 years. “They bend too far because they don't want to be as strict as their own parents were. But they also feel less confident about their parenting skills. Their kids,in turn,feel more anxious.”

小题1:Bossy children like Stephen Jackson_________.

A.make good decisions

B.show self-centeredness

C.lack care from others

D.have little sense of fear小题2:The underlined phrase “inheritable trait” in Paragraph 2 means ___________.

A.inborn nature

B.developed character

C.accepted theory

D.particular environment小题3:The study on bossy behavior implies that parents_________.

A.should give more power to their children

B.should be strict with their children

C.should not be so anxious about their children

D.should not set limits for their children小题4:What is the passage mainly about?

A.How bossy behavior can be controlled.

B.How we can get along with bossy children.

C.What leads to children's bossy behavior.

D.What effect bossy behavior brings about.

单项选择题