Which of the following cities is closest to Berlin in weather conditions

A．Online schooling is more convenient and efficient.
B．Online schooling lacks in face-to-face contact and socialization.
C．Online schooling is not for everyone.
D．An overall estimate on online schoolin

A．what taken as the guiding principle of the Florida Virtual School
B．words placed at the beginning of a book or a chapter
C．a slogan put on the wall
D．words used in advertisements