单项选择题
One of the professor's greatest attributes is ()
A. when he gives lectures B. how in the manner that he lectures C. the way to give lectures D. his ability to lecture
单项选择题 All those youngesters will become ()in ten years.
单项选择题 Adams now maintains that it is less important to save the nation ()to a perilous future.
单项选择题 All of the plants now raised on farms, have been developed from plants ()wild.