尤文肉瘤的X线表现特征为（） A.无骨膜反应，病灶骨皮质膨胀变薄，呈肥皂泡样改变 B

在直角坐标系中，已知点P（-3，2），点Q是点P关于x轴的对称点，将点Q向右平移4个单位得到点R，则点R的坐标是（    ）。

一本《童话故事书》6元，一本《西游记》8元，买a本《童话故事》和b本《西游记》，一共需______元．

Questions 53 to 57 are based on the following passage:The Internet can make the news more democratic, giving the public a chance to ask questions and seek out facts behind stories and candidates, according to the head of the largest US on-line service.’But the greatest potential for public participation is still in the future,’ Steven Case, chairman of America On-line, told a recent meeting on Journalism and the Internet sponsored by The Freedom Forum, though some other speakers say the new technology of computers is changing the face of journalism, giving reporters access to more information and their readers a chance to ask questions and turn to different sources.’You don’t have to buy a newspaper and be confined to the four comers of that paper anymore.’ Sam Meddis, on-line technology editor at USA Today, observed about the variety of information available to computer users.But the speakers noted the easy access to the internet also means anyone can post information for others to see.’Anyone can say anything they want, whether it’s right or wrong.’ said Case. Readers have to determine for themselves who to trust. ’In a world of almost infinite voices, respected journalists and respected brand names will probably become more important, not less,’ Case said.’The internet today is about where radio was 80 years ago, or television 50 years ago or cable 25 years ago, ’he said. But it is growing rapidly because it provides people fast access to news and a chance to comment on it.

Which of the following statements is true

A．Only respected journalists can post information on the internet for others to see.

B．Respected journalists will probably become more important than before.

C．When people read newspapers, they have to stay in the comers of the street.

D．The greatest potential of public participation of the internet is in the near future.

达尔文因病逝世，人们为了表达对他的敬仰，把他葬在牛顿的墓旁。下面可以最恰当地解释人们这种做法的是（）

A.他继承和发展了牛顿的经典力学，使牛顿的力学体系成为近代最具影响力的力学体系

B.牛顿把造物主从无生命的现象中驱逐出去，而达尔文把造物主从有生命的研究领域驱逐出去

C.他和牛顿一样，在科学上有着惊人的洞察力和坚忍不拔的探究精神

D.进化论对人类文明进程的影响要远远大于牛顿经典力学对人类文明进程的影响