The pilgrims came to America after being ______ for their religious beliefs.

A．the use of machines to produce science fiction
B．the wide use of machines in manufacturing industry
C．the invention of tools for difficult and dangerous work
D．the elite’s cunning tackling of dangerous and boring work

A．proteins existed in specific group types
B．proteins could have been shown to direct the synthesis of other proteins
C．antigens were always destroyed by proteins
D．antibodies were composed only of protein