从5名男生和4名女生中选出4人去参加辩论比赛。

（1）如果4人中男生和女生各选2人，有多少种选法？

（2）如果男生中的甲与女生中的乙至少要有1人在内，有多少种选法？

（3）如果4人中必须既有男生又有女生，有多少种选法？

The passage implies which of the following

A．The time of day when food is consumed affects its nutritive value.

B．Different foods can be combined to increase total nutrition value.

C．It can be detrimental to your health to eat breakfast foods later in the day.

D．When food is eaten has no bearing on its nutritive effects.