单项选择题
A.4B.5C.7D.8
A.5B.6C.7D.8
A.1∶1B.3∶2C.8∶5D.11∶6
A.8B.9C.10D.11
A.7800B.6975C.5325D.4500
A.1.4元B.2.1元C.2.8元D.3.5元
A.69%B.70%C.78%D.82%
A.144B.136C.128D.142
A.16B.20C.26D.30
A.100B.150C.200D.250
A.386B.486C.586D.686