According to the weather report, the pollution index was________.

A．because it costs too much
B．because there are too many freshmen
C．because the rooms are too small
D．because it’’s too noisy

A．Dogs are now treated as part of a family.
B．Dogs still perform all the duties they used to do.
C．People now keep dogs for the same reasons as before.
D．Only old people are seen walking their dogs.