FROM THE PASSAGE IT CAN BE CONCLUDED THAT MUTE SWANS ARE _________...

79. - DE THI DAI HOC TIENG ANH
DE THI DAI HOC TIENG ANH
79. From the passage it can be concluded that mute swans are ______________.a. a problem for coastal pondsb. welcome in most parts of North Americac. more numerous than other types of swansd. unattractive in apprearance