There are several steps that can be taken, of which the chief one is to demand of all the organizations that exist with the declared objectives of safeguarding the interests of animals that they______clearly where they stand on violence towards people.

A．will declare

B．should declare

C．have declared

D．are declaring

起飞后为了得到最大的爬升梯度，应该采用什么方式爬升（）.

A.最大爬升率

B.最大飞行速度

C.最大爬升角