有机整体的中心是（） A.肝 B.脑 C.心 D.五脏 E.经络

在一个直角三角形中，已知一个锐角是65°，另一个锐角是多少度？

人的第一种记忆是遗传记忆。性细胞中记录了一切生物的结构和活动原则，这些特性随着性细胞世代相传。遗传记忆惰性大，正是这样才保证下一代与上一代的相似，才避免了自然界各种因素的混杂。遗传记忆的信息量非常大，达1010比特，科学界认为，只要有2％的遗传因子就能保留人的结构的全部信息。那么，其余98％的遗传因子包含的是什么信息呢原来，一部分遗传因子是从人类祖先那里继承下来的，这部分因子可以说自然界赐予的。它们在通常条件下处于隐蔽地位，一旦地球发生灾难，生存条件变得与祖先经历过的相似的时候，现代人就会产生有助于自己生存的器官。第二种记忆是免疫记忆。人的血液中有着极少的富有自我牺牲精神的细胞，它们生存的时间极短，主要职能是尽量多地消灭人体的敌人。淋巴细胞对侵入血液中的细菌或者简单有毒物质做出快速反应，生成抗体，把有害物质粘住，不让它们进入其他器官。而消灭来敌的重任则落在血液中的吞噬细胞头上，这些细胞能够毫不费力地区别外来细胞，能够把它们记住并把记忆保留下来。人一旦得过麻疹或猩红热，就会获得终身免疫力。第三种记忆是神经记忆。当我们说“我的记忆不如他好”时指的就是这种记忆。它的信息量高达1111比特。目前已知的神经记忆是由几个阶段组成的。这种记忆先从知觉开始，感觉越强烈，记得越牢。神经记忆分短期的和长期的两种。短期信息只保留数分钟，这种记忆量不大，记忆时间短，而且这种记忆十分不牢靠。如果信息十分重要，那么它就可能变为长期记忆，甚至终身记忆。信息从短期记忆转变为长期记忆的过程称为突变，是位于大脑额叶深部的海马发挥了作用。

下列理解符合原文的一项是（）。

A．人的结构的全部信息只保留在人体2％的遗传因子中

B．某些遗传因子常常是隐蔽的，一旦灾难发生，生活环境变了，人就会产生利于生存的器官

C．有的人记忆力很好，常常“记忆犹新”，那是由于他的突变能力很强

D．能否记住信息不是短期记忆与长期记忆的主要区别

A．255.255.255.192
B．255.255.255.240
C．255.255.255.224
D．255.255.255.248

College sports in the United States are a huge deal. Almost all major American universities have football, baseball, basketball and hockey programs, and (1) millions of dollars each year to sports. Most of them earn millions (2) as well, in television revenues, sponsorships. They also benefit (3) from the added publicity they get via their teams. Big-name universities (4) each other in the most popular sports. Football games at Michigan regularly (5) crowds of over 90, 000. Basketball’s national collegiate championship game is a TV (6) on a par with any other sporting event in the United States, (7) perhaps the Super Bowl itself. At any given time during fall or winter one can (8) one’s TV set and see the top athletic programs--from schools like Michigan, UCLA, Duke and Stanford-- (9) in front of packed houses and national TV audiences.

The athletes themselves are (10) and provided with sch61arships. College coaches identify (11) teenagers and then go into high schools to (12) the country’s best players to attend their universities. There are strict rules about (13) coaches can recruit--no recruiting calls after 9 p. m. , only one official visit to a campus--but they are often bent and sometimes (14) . Top college football programs (15) scholarships to 20 or 30 players each year, and those student-athletes, when they arrive (16) campus, receive free housing, tuition, meals, books, etc.

In return, the players (17) the program in their sport. Football players at top colleges (18) two hours a day, four days a week from January to April. In summer, it’s back to strength and agility training four days a week until mid-August, when camp (19) and preparation for the opening of the September-to-December season begins (20) During the season, practices last two or three hours a day from Tuesday to Friday. Saturday is game day. Mondays are an officially mandated day of rest.

19（）

A.recalls

B.enlists

C.convenes

D.collects

桥面铺装有多种形式，其中以（）使用较为广泛。

A、沥青表面处治

B、泥结碎石

C、水泥混凝土

D、沥青混凝土