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Questions 14 -16 are based on the following passage. You now have 15 seconds to read questions 14 -16. According to the author, the effective way to spread the use of computers is to teach ______.

A. how to use computers
B. what computers use
C. where computers can be used
D. how computers work

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(21) summary of the physical and chemical (22) of life must begin, not on the Earth, but (23) the Sun; in fact, (24) the Sun’s very center. (25) is here that is to be found the (26) of the energy that the Sun constantly (27) space (28) light and heat. This energy is liberated at the center of the Sun as billions upon billions of nuclei hydrogen atoms (29) each other and (30) to form nuclei of helium, and, (31) doing so, (32) some of the energy that is stored in the nuclei of atoms. The output of light and heat of the Sun (33) that some 600 million tons of hydrogen (34) helium in the Sun every second. This the Sun (35) for several thousands of millions of years. 32（）

A. be switched to
B. be diverted into
C. be reverted to
D. be converted to

Questions 17-20 are based on the following passage. You now have 20 seconds to read questions 17-20. The phrase "ring up sales" most probably means ______.

A. make an order of goods
B. record sales on a cash register
C. call the sales manager
D. keep track of the goods in stock

某施工单位通过投标获得了某市一高级公路路面施工工程。由于该项目的各专业人才集中在现场办公，专业技术人员在项目施工中协同工作，所以在劳动力组合管理方面采取J了混合工作队式管理方式。该路面底基层为填隙碎石，基层为水泥稳定碎石，面层为沥青混凝土。该段高级公路全长80 km，设计时速：120 km/h。填隙碎石的施工_丁艺包括：①运输和摊铺粗碎石；②撒布填隙料；③初压；④再次撒布填隙料；⑤振动压实。该施工单位依据有关标准和规范，并结合建设任务、施工管理和质量检验评定，狠抓工程质量，在各分部分项工程完成后，做了质量检验。根据以上材料，回答下列问题：可根据场景中该段路面底基层的( )，计算该段路面施工所需要的粗碎石数量。

A. 按确定的配合比
B. 规定的压实干密度
C. 宽度
D. 厚度
E. 松铺系数

(21) summary of the physical and chemical (22) of life must begin, not on the Earth, but (23) the Sun; in fact, (24) the Sun’s very center. (25) is here that is to be found the (26) of the energy that the Sun constantly (27) space (28) light and heat. This energy is liberated at the center of the Sun as billions upon billions of nuclei hydrogen atoms (29) each other and (30) to form nuclei of helium, and, (31) doing so, (32) some of the energy that is stored in the nuclei of atoms. The output of light and heat of the Sun (33) that some 600 million tons of hydrogen (34) helium in the Sun every second. This the Sun (35) for several thousands of millions of years. 30（）

A. relieve
B. relieving
C. release
D. releasing