题目内容
随着计算机技术和软件技术的发展，为满足不同的应用要求，出现了多种类型的操作系统。以下(8)不是基本的操作系统类型。
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网络中的计算机资源主要指的是(49)。
印花税的税率有两种形式，即比例税率和定额税率。加工承揽合同适用比例税率，税率为万分之五，营业账簿适用定额税率，税额为每件5元。()
个人因与用人单位解除劳动关系而取得的一次性补偿收入，其收入在当地上年职工平均工资 3倍数额以内的部分，免征个人所得税。()
SECTION B PASSAGES
Directions: In this section, you will hear several passages. Listen to the passages carefully and then answer the questions that follow.
听力原文： The Stone Age was a period of history which began in approximately 2 million B.C. and lasted until 3000 B, C. Its name was derived from the atone tools and weapons that modern scientists found. This period was divided into Paleolithic, Mesolithic, and Neolithic Ages. During the first period (2 million to 8000 B. C. ), the first hatchet and use of fire for heating and cooking were developed. As a result of the Ice Age, which evolved about 1 million years into the Paleolithic Age, people were forced to seek shelter in caves, wear clothing and developed new tools.
During the Mesolithic Age (8000 to 6000 B. C. ) people made crude pottery and the first fish hooks, took dogs hunting, and developed a bow and arrow which was used until the fourteenth century A. D.
The Neolithic Age (6000 to 3000 B. C. ) saw humankind domesticating sheep, goats, pigs, ,and cattle, being less nomadic than in: previous eras. establishing permanent settlements and creating government.
The speaker states that the Stone Age was so named because ______.
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