1-C. The Internet has become so powerful a tool that people living anywhere can access any educational resource.The Internet has become so powerful a tool that people living anywhere can access any educational resource.
2-C. Researchers have discovered tools in the southeastern United States which are very different from those found in the north.Researchers have discovered tools in the southeastern United States which are very different from those found in the north.
3-C. Proof of their existence was found in tools discovered in Alaska.Proof of their existence was found in tools discovered in Alaska.
証拠は、彼らの存在のダヨ、見い出された、発見された道具の中にダヨ、アラスカでダヨ。
4-C. (3) Every time you use a computer, you are relying on one of the most important numerical tools in the modern world: the base-2 system.(3) Every time you use a computer, you are relying on one of the most important numerical tools in the modern world: the base-2 system.
5-C. In fact, it is one of the first kitchen tools to disappear from supermarkets when a disaster occurs.In fact, it is one of the first kitchen tools to disappear from supermarkets when a disaster occurs.
6-C. One of the most important kitchen tools is the simple hand-operated can opener - the manual can opener.One of the most important kitchen tools is the simple hand-operated can opener - the manual can opener.