单项选择题

3-15. The elements forming the substitutional solid solution can be infinitely miscible, and the elements forming interstitial solid solution can only be finitely miscible.

A．true
B．false

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单项选择题

A、
B、
C、
D、

多项选择题

By using intonations, we may .
A、indicate the attitudes and emotions of the speaker
B、tell the difference between statements and questions
C、focus on important elements of the spoken message
D、regulate conversational interaction