The first man who cooked his food, instead of eating it raw, lived so long ago that we have no idea who he was or where he lived. We do know, however, that (1) thousands of years, food was always eaten cold and (2) . Perhaps the first cooked food was heated accidentally by a (3) fire or by the molten lava form an erupting (4) . No doubt, when people first tasted food that had been cooked, they found it tasted better. However, (5) after this discovery, cooked food must have remained a rarity (6) man learned how to make and control fire (7) .
Primitive men who lived in hot regions could depend on the heat of the sun (8) their food. For example, in the desert (9) of the southwestern United States, the Indians cooked their food by (10) it on a flat (11) in the hot sun. They cooked pieces of meat and thin cakes of corn meal in this (12) . We can surmise that the earliest kit
A. newest
B. latest
C. first
D. worst
| It is possible to stop most drug
addiction in the United States within a very short time. Simply make all drugs
available and sell them at cost. Label each drug with a precise description of
what effect—good and bad—the drug will have on the taker. This will require
heroic honesty. For the record, I have once almost every drug and like none, disproving the popular theory that taking a single smoke of opium will enslave the mind. Nevertheless many drugs are bad for certain people to take and they should be told why in a sensible way. Along with advice and warning, it might be g A. unacceptable to the majority of people B. not an effective way to stop drug addiction C. in the interest of the people and the governors D. in agreement with the basic rights of citizens [单选题]《铁路交通事故调查处理规则》适用于( )发生事故的调查处理。国家铁路.合资铁路.地方铁路以及专用铁路.铁路专用线等。
A.国家铁路.合资铁路 B.国家铁路 C.国家铁路.合资铁路.地方铁路 D.国家铁路.合资铁路.地方铁路以及专用铁路.铁路专用线 [单选题]
民用机场使用许可证应当经（）审查批准后颁发。 A.国务院 B.国务院民用航空主管部门 C.民航地区管理局 D.以上都不对 [单选题]在电气设备上工作时，保证安全的技术措施由()或有相应资格的人员执行，并应有监护人在场。
A.运行人员 B.检修人员 C.工作负责人 D.工作班成员 [单选题]工作票签发人或工作负责人应根据现场安全条件、施工范围、工作需要等具体情况设置(),并确定监护内容和被监护人员。
A. 技术人员 B. 专责监护人 C. 安监人员 D. 领导 [多选题]裂解汽油的脱硫反应能进行的反应有（ ）。
A.硫醇加氢 B.硫醚加氢 C.噻吩加氢 D.二硫化物加氢 [单项选择]封闭式直角沟槽通常用（）铣刀铣削加工。
A. 三面刃 B. 键槽 C. 盘形槽 D. 锯片 [单选题]在接电源线时，开关应控制( )
A.零线 B.相线 C.地线 D.以上均可 我来回答: 提交
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