汉朝时，繁盛的东西二京指的是 ①镐京②成阳③洛阳④长安[ ] A．①③ B．③④

I．右图是电解水的实验示意图，a，b两管理论上得到的气体体积比为______；这变化的文字表达

式是______；此反应为______反应（填基本反应类型）．

Ⅱ．某研究小组对实验后的废干电池筒内的黑色物质（可能含有碳、二氧化锰、氯化锌、氯化铵等）

进行研究，（氯化锌和氯化铵可以溶于水）实验过程如下：

（1）操作②的名称是______，其中玻璃棒的作用是______．进行该操作之后，发现得到的液体仍然浑浊，出现这种现象的原因是：______；______．

（2）操作④的试管中产生的气体使带火星的木条复燃，产生该气体反应文字表达式是______．

再障的骨髓表现主要是

A．红骨髓总量减少，非造血细胞减少

B．骨髓增生减低

C．骨髓增生活跃

D．红骨髓显著减少，脂肪组织增多

E．红骨髓显著增多

In this century the traditional American family is constantly faced with the threat of breakdown. Some sociologists suggest that one little-noticed cause may be the introduction of the TV dinner.

Before the appearance of television sets, the American dinner was a big event for the family. In many homes, dinner time may be the only time when everyone got together. A typical dinner was usually in three stages. In the preparation stage, the children and Father frequently helped with setting while Mother put the last touches on the roast. In the eating stage, family members shared the day's experiences and more than food was eaten. In this stage families got to know one another and made joint decisions around the dinner table, and thus the family unit was strengthened. In the cleaning-up stage, children or Father again gave their hands, so that their importance to the home community was clear. Unfortunately, all of these have been removed by a product---the television set.

By the beginning of the 1980s, the typical American family dinner was just twenty minutes long. The speed-up of the once-leisurely experiences is clearly connected to the pace of modern life and maybe a model of the modern life is the TV dinners --- meals designed to be eaten from the beginning to the end of a half-hour program. The once family affair has now become nothing more than the use of a fork and knife.

64. The underlined word in the second paragraph can be replaced by ____.

A. big             B. important             C. combined      D. separate

65. In the past, Americans tended to ____.

A. spend more time eating their food at dinner table

B. eat more food than they have today

C. spend more time talking about their day's experiences at dinner table

D. talk so much that they forgot to eat

66. The shortening of the dinner time in America is related to ____.

A. the TV programs                    B. the pace of modern life

C. the wide use of electrical equipment    D. the popularity of fast food

67. The best title for this passage might be ____.

A. Talk at Dinner Table                  B. TV Dinner

C. Pace of Modern Life                        D. Problems Caused by TV

如果某群体的杂合体（Aa）占1/3，那么经过两代自交后，其群体中杂合体的百分比为（）。

质核基因的区别（）。

A、质基因一般为紧密结构的小型环状DNA分子，与蛋白质结合

B、与核基因相比，质基因所拥有的遗传信息量很少，功能完备，但居于次要和从属的地位

C、质基因一般为紧密结构的小型环状DNA分子，不与蛋白质结合

D、与核基因相比，质基因所拥有的遗传信息量很少，功能不完备，居于次要和从属的地位