A:4
B:8
C:16
D:32
解二元一次方程组
⑴Let's go to the library.____ A.
⑵School is over.It's time to go home.____ B.
⑶It's hot.I can swim.____ C.
⑷Today is snowy and cold.____ D.
⑸We have art class at 3 o'clock.____ E.
下列有关人类病因和病症名称的匹配,正确的是( )