会议总结目的是() A.提高工作水平 B.检查各小组的执行情况 C.总结经验，激励下

敏定偶的组成成分为（）

A.炔雌醇0.03mg加孕烯二酮0.075mg

B.炔雌酮0.03mg加18-甲基炔诺酮0.3mg

C.炔雌酮0.03mg加地索高诺酮0.3mg

D.炔雌酮0.03mg加炔诺酮0.3mg

E.炔雌醇0.03mg加甲地孕酮0.3mg

重金属污染物对人体健康危害巨大。图1为重金属污染物进入人体的路径示意图，图2为某高速公路两侧土壤中铅、镉浓度示意图。读图回答问题。

（1）产生重金属污染的生产活动有__________和_________。重金属污染物进入人体的途径有__________和__________。

（2）下列示意图①、②、③能正确表示重金属元素在环境中循环过程的是_______________。

（3）高速公路两侧土壤中重金属污染物浓度的分布特点是_____________；其主要来源是___________。

（4）降低高速公路两侧土壤重金属污染物浓度的有效措施主要有__________。

The Japanese Macaca monkey has been studied in the wild for over 50 years. In 1952, on one small Japanese island, scientists dropped some (21) in the dirt for the monkeys. The monkeys liked their taste, but they found the dirt (22) .
One clever 18-month-old monkey found she could (23) the problem by washing the sweet potatoes in a nearby river. She taught this to her mother. Her (24) also learned this new way and they taught their mothers too.
All the younger monkeys (25) learned to wash the dirty sweet potatoes to make them (26) to eat. But many old monkeys found it very hard to learn this and still ate the (27) sweet potatoes.
Then something very strange (28) In the autumn of 1958, scientists found that the monkeys on other nearby (29) began washing their sweet potatoes too. Scientists still don’t fully understand how this knowledge was (30) from one island to another.

Ⅱ. 完形填空

/Close
阅读下面短文，掌握其大意，然后再各题所给的四个选项(A、B、C和D)中选出一个最佳选项。

A．lost

B．dropped

C．passed

D．left

下列关于双向板肋形楼盖的说法正确的有（）

A、双向板沿两个方向弯曲和传递荷载，所以两个方向均需配置受力钢筋

B、配筋时，细而密的配筋较粗而疏的配筋有利

C、双向板的板厚不宜小于80mm

D、双向板在荷载作用下，会把压力均匀的传给四边支座

E、双向板的配筋方式有弯起式和分离式两种

下列关于DNA、染色体、基因的关系，其中不正确的是（）

A.每条染色体有一个DNA分子，经复制后每条染色单体上有一个DNA分子

B.每个DNA分子上有许多基因

C.基因在染色体上呈线性排列

D.基因在DNA分子双链上成对存在