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The author probably feels that twins’ problem 

• A、can not be solved because solution is very cruel

• B、can be solved because twins will be separated

• C、can not be solved unless the twins are forced to live in an ordinary environment

• D、can be solved if the adults communicate with them more often

60（）

Silver is the best conductor of electricity, copper _____it closely.（）

• A、followed

• B、following

• C、to follow

• D、being followed