This is my day

    I am a doctor. I work at night. I go to work at 6:30 p. m. I eat dinner at 9:30. I usually go home at 8:00 in the morning. After breakfast, I go to bed at 9:10 a. m. I usually get up at 2:30 in the afternoon. I eat lunch at 3:00 in the afternoon. Then I play sports at 4:00 in the afternoon.

    This is my day. I enjoy my life.

已知a、b是实数，x=a²+b²+20，y=4（2b-a）．则x、y的大小关系是（    ）

读某山区交通线路走向图，回答下列问题．