不定项选择

Ceramics are crystalline compounds that combine metallic and nonmetallic elements.

A．正确
B．错误

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单项选择题

How should you pronounce the /θ/ sound?

A． Put your tongue behind your lower teeth.
B． Put your upper teeth on your bottom lip.
C． Put your tongue between your teeth.
D． Put your tongue behind your upper teeth.

单项选择题