施工过程中发生变更，而合同中没有适用或类似工程的价格，应( )。

A．由工程师提出适当的变更价格，经发包人批准后执行

B．由承包人提出适当的变更价格，经工程师确认后执行

C．由发包人提出适当的变更价格，经承包人同意后执行

D．由设计人提出适当的变更价格，经发包人通知承包人

Which of the following statements is true of the Parkinson’s disease

A．Parkinson’s always shows the same symptoms on different people,

B．People inflicted with Parkinson’s often have a shaking hand or a stiff hand.

C．The symptoms of Parkinson’s vary among different patients.

D．Victims of Parkinson’s find it difficult to recall what they have eaten for dinner.