______ the center of our planetary system was considered as heresy by the church in the Middle Ages.

Mac’s close ______ to his brother made people mistake t...

单项选择题Mac’s close ______ to his brother made people mistake them for one another.

By the middle of the 21st century, the vast majority of...

单项选择题By the middle of the 21st century, the vast majority of the world’s population ______ in cities rather than in the country.

With one leg broken in that car accident, he cannot eve...

单项选择题With one leg broken in that car accident, he cannot even walk, ______ run.