单项选择题
A．They make decisions by tossing coins. B．They are not physically separated. C．They think exactly the same way. D．They share most of their vital organs.
A．One sixth of them are seriously polluted. B．One third of them arc seriously polluted. C．Half of them are seriously polluted. D．Most of them are seriously polluted.
A．She thinks the man should have helped earlier. B．She doesn’t need the man’s help. C．She doesn’t know the boxes are heavy. D．She wants the man to help with the boxes.