Following the construction of the wall what were the only official ways to cross between east and west berlin

whose power in the senate is equal to the power of the speaker of the house?

seeing as no choices were provided, i'll do my best to answer it from knowledge.

job specialization promotes work ethic to the person doing the job. he/she may be strong in the arms and able to lift things, specializing him/her in a job where you lift and carry.