问题 填空题

Part 1


·Read thefollowingpassage, eight sentences have been removed from the article.
·Choose from the sentences A-H the one whichfits each gap.
·For each gap (1-8) mark one letter (A-H) on the Answer Sheet.
·Do not mark any letter twice.
The single, decisive factor that made it possible for mankind to settle in permanent communities was agriculture. (1) Once people could control the production of food and be assured of a reliable annual supple of it, their lives changed completely.
Fanning was a revolutionary discovery. (2) With more food available, more people could be fed. Populations therefore increased. The growing number of people available for more kinds of work led to the development of more complex social structures. (3)
Farming the world over has always relied upon a dependable water supply. For the earliest societies this meant rivers and streams or regular rainfall. (4) Later communities were able to develop by taking advantage of the rainy seasons.
All of the ancient civilizations probably developed in much the same way, in spite of regional and climatic differences. (5) Heavier pottery replaced animal-skin gourds as containers for food and liquids. Cloth could be woven from wool and flax. Permanent structures made of wood, brick, and stone could be erected.
The science of mathematics was an early outgrowth of agriculture. People studied the movements of the moon, the sun, and planets to calculate seasons. (6) With a calendar it was possible to calculate the arrival of each growing season. Measurement of land areas was necessary if property was to be a factor in farming and housekeeping. (7) All of the major ancient civilizations in Mesopotamia, Egypt, the Indus Valley, and China emerged in the 4th millennium BC. Historians still debate over which one emerged first. It may well have been the Middle East, in an area called the Fertile Crescent. This region stretches from the Nile River in Egypt northward along the coast of former Palestine, then eastward into Asia to include Mesopotami
  • a. (8) This kind of larming depended on the reproduction of seed, normally from grain crops.A. It not only made settlements possible and ultimately the building of cities but it also made available a reliable food supply.B. Later came measures of value as commodity and money exchange became common.C. In this area people settled along the riverbanks and practiced field agriculture.D. After farming was developed in the Middle East in about 6500 BC, people living in tribes or family units did not have to be on the move continually searching for food or herding their animals.E. As villages grew, the accumulation of more numerous and substantial goods became possible.F. With a food surplus, a community could support a variety of workers who were not farmers.G. The first great civilizations grow up along rivers.H. In doing so they created the first calendars.

答案

参考答案:A

解析: 第2段首句提到了耕种是一次革命性的发现。句A“它不仅使定居成为可能,最终形成城市,并且可以提供稳定的食物来源。”很显然“它”指的是农业,这句话讲述了农业的重大作用,是对第1句中革命性的解释说明——为何耕种被称为革命性的发现,因此A为正确选项。

实验题

实验“探究平抛运动在水平方向上的运动规律”中,得到平抛运动轨迹的实验步骤如下:

①在实验桌上安装好斜槽,调节其末端切线水平并伸出桌面外。

②在木板上固定白纸,把木板竖直固定在支架上并贴近实验桌边。

③将斜槽的末端投影到白纸上并标上O,O点即为小球做平抛运动的坐标原点。

④以O点为坐标原点,根据重锤线方向画出竖直向下的y轴,过O点作水平线为x轴。

⑤把小球从斜槽上的不同位置无初速释放,观察小球的运动轨迹。尝试用有孔卡片确定小球经过的位置,在从标纸上记录该点的位置。

⑥改变有孔卡片的位置,按上述的方法确定其他各点的位置,最后取下白纸。

⑦将白纸上的一系列点用光滑的曲线连接起来,得到小球做平抛运动的轨迹

(1)以上实验步骤中,有两个步骤是错误的,请指出是哪一步骤并说明应如何改正?

A .                ▲                                             

B.                 ▲                                                

(2)纠正以上错误外,为了能更准确地描绘运动轨迹,下面列出一些操作要求,将你认为正确选项的前面字母填在横线上:  ▲ 

A.实验中可采用较大的木球以便于记录其所经过的位置

B.记录小球位置用的有孔卡片每次必须严格地等距离下降

C.小球运动时不应与木板上的白纸(或方格纸)相接触

D.光滑的曲线连接所记录的点(位置)时,不必保证曲线经过每一个点

(3)若实验中,记录了y轴的位置,但忘了记下坐标原点,还能否根据所得的曲线确定平抛的初速度?  ▲(选填“能”或“不能”)。

(4)为了确定小球在不同时刻所通过的位置,有同学采用了如下方法:如图所示的装置,在一块平木板上固定复写纸和白纸,竖直立于槽口前某处,使小球从斜槽上紧靠挡板处由静止滑下,小球撞在木板上留下痕迹A;又将木板向后移距离x,使小球从斜槽上紧靠挡板处由静止滑下,小球撞在木板上留下痕迹B;再将木板再向后移距离x,小球再次从斜槽上紧靠挡板处由静止滑下,得到痕迹C。测得木板每次后移距离xAB间距离y1 ,AC间距离y2 ,已知当地的重力加速度为g,根据以上直接测量的物理量可求得小球的初速度为 ▲  。

判断题