单项选择题

Is it difficult for you to get up in the morning Yes Then Hiroyuki of Japan has a special bed for you. Hiroyuki’s bed will get you up in the morning!
The bed is connected to an alarm clock. First, the alarm clock rings. You have a few minutes to wake up. Next a tape recorder in the bed plays soft music or other pleasant sounds. The tape recorder in Hiroyuki’s then says in a sweet voice, "Wake up, darling, please. " A few minutes later, a second recording plays. The second recording can be loud music or unpleasant sounds. Hiroyuki hears a recording of his boss. His boss shouts, "Wake up immediately, or you’ll be late!"
If you don’t get up after the second recording, you’ll be sorry. A mechanical "foot" is in the bed. The mechanical foot kicks you in the head. Then the bed waits a few more minutes. What! You’re still in bed! Slowly, the tip of the bed rises higher and higher. The foot of the bed goes lower and lower. Finally, the bed is vertical (垂直的). You slide off the bed and onto the floor. You are awake and out of bed.
The bed can wake you up in ______ ways.