Stone tools began to be replaced around 6,000 years ago by metal tools, who were used to build instruments and simple machines.（）
A: began
B: who
C: to build
D: simple
A: began
B: who
C: to build
D: simple
举一反三
- The "New Stone Age" around 10,000 years ago saw the invention of metal tools and the wheel.
- The "New Stone Age" around 10,000 years ago saw the invention of metal tools and the wheel. A: 正确 B: 错误
- With metal tools, the Mayans were able to build high temples and made various works of art.
- The first primitive man known to have existed in China is ( ), who lived about 1.7 million years ago. ( ),who existed more than 600,000 years ago at Zhoukoudian, in the vicinity of modern Beijing, could walk upright, make and use simple tools, and make use of ( ) .
- With tools made of______, the Mayans were able to build high temples and made various works of art.