中国大学MOOC: Natural rubber usually is much stronger and harder than vulcanized rubber.

Natural rubber usually is much stronger and harder than vulcanized rubber. A: 正确 B: 错误

……wearing rubber boots…同义结构 A: in rubber boots B: have rubber boots on

Wood does not conduct electricity, ______． A: nor rubber does B: nor does rubber C: also doesn’t rubber D: so doesn’t rubber

Wood does not conduct electricity; _____. A: so doesn’t rubber B: also doesn’t rubber C: nor does rubber D: nor rubber does

6) Rubber is _________, so a ball made of rubber is easy to bounce.

My shoes are made of rubber.

Iron and steel are flexible. But they are not as flexible ______ rubber. A) as C) to B) for D) by A: Iron and steel are flexible. But they are not as flexible ______ rubber. B: as C: for D: to E: by

Rubber is a ________________ of electricity.

My cat would not have bitten the toy fish _________ it was made of rubber.