A．含有离子键的化合物一定是离子化合物

B．在共价化合物中一定含有共价键

C．溶于水能导电的化合物一定是离子化合物

D．离子化合物中不一定都含有金属元素

An ultimate purpose of learning a foreign language in a Grammar-Translation classroom is to enable the learners to______.

A．think and communicate in the target language

B．get a practical command of the four basic skills of the language

C．get the same types of abilities that native speakers have

D．read and translate its literatur