下列命题为真命题的是（ ） A．a＞b是1a＜1b的充分条件 B．a＞b是1a＜1b

光滑水平面上有一直角坐标系，质量m=4kg的质点静止在坐标原点O处。先用沿+x轴方向的力F₁ =" 8" N作用了2s；然后搬去F₁，并立即用沿+y方向的力F₂=24N作用1s，则质点在这3s内的轨迹为图中的（    ）

周恩来在万隆会议上提出了解决各国之间分歧的方针是[ ]

A．“求同存异”

B．“互不侵犯”

C．“和平共处”

D．“平等互利”

容易引起职业性白内障的是()。

A.红外线

B.紫外线

C.激光

D.β粒子

Among various programs, TV talk shows have covered every inch of space on daytime television. And anyone who watches them regularly knows that each one is different in style. But no two shows are more opposite in content, while at the same time standing out above the rest, than the Jerry Springer and Oprah Winfrey shows.

Jerry Springer could easily be considered the king of "rubbish talk". The topics on his show are as surprising as can be. For example, the show takes the ever-common talk show titles of love, sex, cheating, and hate, to a different level. Clearly, the Jerry Springer show is about the dark side of society, yet people are willing to eat up the troubles of other people's lives.

Like Jerry Springer, Oprah Winfrey takes the TV talk show to its top. But Oprah goes in the opposite direction. The show is mainly about the improvement of society and different quality of life. Contents are from teaching your children lessons, managing your work week, to getting to know your neighbors.

Compared to Oprah, the Jerry Springer show looks like poisonous waste being poured into society. Jerry ends every show with a "final word". He makes a small speech about the entire idea of the show. Hopefully, this is the part where most people will learn something very valuable.

Clean as it is, the Oprah show is not for everyone. The show's main audience are middle-class Americans. Most of the people have the time, money and ability to deal with life's tough problems. Jerry Springer, on the other hand, has more of a connection with the young adults of society. These are 18-to 21year-olds whose main troubles in life include love, relationship, sex, money and drug. They are the ones who see some value and lessons to be learned through the show's exploitation.

46. Compared with other TV talk shows, both the Jerry Springer and the Oprah Winfrey shows are ______.

A. more interesting          B. unusually poplar       C. more detailed           D. more formal

47. Though the social problems Jerry Springer talks about appear unpleasant, people who watch the shows ______.

A. show disbelief in them                                         B. are ready to face up to them

C. remain cold to them                                     D. are willing to get away from them

48. Which of the following is likely to be a topic of the Oprah Winfrey show?

A. A new type of robot.                                    B. National hatred.

C. Family income planning.                              D. Street accident.

49. We can learn from the passage that the two talk shows ____.

A. have become the only ones of its kind                   B. exploit the weaknesses in human nature

C. appear at different times of the day                    D. attract different people

50. What is the advantage of the Jerry Springer show?

A. The show exposes the dark sides of society.

B. The show pours poisonous waste into society.

C. Jerry sums up the whole idea of the show.

D. Jerry talks abou the improvement of society.

DRIVE灯亮下面哪种说明不正确（）

A.可能IDG滑油压力低于标准

B.可能IDG滑油量低于标准

C.可能发动机运转时发生低频状态

D.故障时需要脱开IDG