军事设施改作民用的，军事机场、港口、码头实行军民合用的，需经( )批准。

A．军区

B．军区和省、自治区、直辖市人民政府

C．国务院和中央军事委员会

D．军区和县级以上地方人民政府

An analyst does research about index management. Which of the following indexes is most likely to be rebalanced frequently（）

A. Price-weighted index.

B. Equal-weighted index.

C. Market-capitalization weighted index.