)

影响血清酶变异的生理因素有()

A．性别

B．年龄

C．进食

D．运动

E．以上都不是

倾斜基牙固定桥取得共同就位道的方法，错误的是（）

A.正畸

B.备牙

C.改变固位体设计

D.双套冠

E.拔除倾斜牙

诊断该疾病准确率较高的是

A．CT平扫

B．MRI

C．超声

D．X线

E．ECT

阅读理解

      Online games, social-networking web sites, and chat rooms are fascinating and motivating for teens

and help with their development. When adults look at teens today, they think what they are doing is

different and seem to be wasting a lot of time. And those activities seem quite foreign. But when we look

closely at what kids are doing, it's not much more different than what their parents did. They are hanging

out with their friends, finding romantic partners, and trying to identify themselves.

     Today's teens are being raised with technologies that allow them to have self-directed learning on

their own terms, on their own time, and without the limitations of a classroom setting. This gives the teens

a feeling of freedom. This is very different from how kids learn in school when they are handed a set

body of knowledge required to master by their teachers.

     Teens were motivated to be addicted to online because they were either driven by interest or

friendship. And there are some specific findings according to a research:

      One major finding is that there is a generation gap in how parents and teens view the teen's online

activities. Adults think the activities draw their attention from school work and are left in the dark about

what their teens are doing online. Teens, on the other hand, understand the value of the Internet and are

motivated to take part.

     Another finding shows that teens are not taking full advantage of the Internet. They are using the social

networks to chat and post photos and make friends, which are important to their development, but they

are not making use of other existing opportunities to learn about astronomy, foreign languages, and other

subjects only a few clicks away.

     Teens are also improving their social skills online by learning the basic social and technical skills

needed to interact (互相作用) in today's digital world.

     Pressure from those of the same age also takes on a new role online. Teens are reporting that they

are more motivated by those of their age online with public spaces that allow the teens to interact and

provide feedback to one another.

     While teens are using the Internet for both social and intellectual development, they are also facing

significant challenges on how to manage their relationships online.

1. The writer is probably ________.

A. a parent

B. a teenager

C. a teacher

D. a researcher

2. Which of the following best describes how the writer thinks about teens and online activities?

A. Supportive.

B. Objective.

C. Understandable.

D. Negative.

3. Which of the following is NOT mentioned in the passage?

A. Internet is a source of learning for teens.

B. Outside classroom learning is equally valuable.

C. Teens need to learn more effectively online.

D. Parents should also learn to use Internet.

4. How many specific(确切的) findings are listed in this passage?

A. Two.

B. Three.

C. Four.

D. Five.

“江山易改，秉性难移”说明的心理现象是（）。

A、个性差异

B、气质天赋性

C、性格差异

D、能力差异