单项选择题It is seldom acceptable to abbreviate words in formal writing.
单项选择题While attempting to find a new route to India, Columbus discovered America by accident.
单项选择题The immense change of the city astonished every member of the conference.
单项选择题Jim has gained so much weight that a lot of his clothes don't fit him any more.
单项选择题We want to know his family background.
