A．He doesn’t want to take any more science courses.
B．He hasn’t taken enough courses in biology.
C．His grades in science courses are good.
D．He likes to take more of such courses.

A．Now society is more difficult for people to get on with unmarried couples than any time before.
B．Now society finds its understanding and forgiving attitudes towards those unmarried people and single parents.
C．Now society can no longer stand so many unmarried couples and single parents.
D．Now law makes it harder for society to accept unmarried couples, unmarried people and single parents.