（）a language family is a group of languages with a common origin and similar vocabulary, grammar, and sound system.

单项选择题Most comets have two kinds of tails, one made up of dust,（）made up of electrically charged particles called plasma.

A．one another
B．the other
C．other ones
D．each other

单项选择题English language publications in China are growing in volume and（）.

A．circulation
B．rotation
C．circumstance
D．appreciation