A．Corporate executives are confident in the stock market trends.

B．Investors in general believe that the outlook for profits is worsening.

C．Some major company executives are selling more shares than buying.

D．The US stock market is expanding at a 5.6 percent annual rate this year.

公民、法人或者其他组织依法取得的行政许可受法律保护，行政机关（）改变已经生效的行政许可。

A.不得擅自

B.不得

C.可以

D.不得随意