玉石合成饰面板是取名贵的各种天然玉石、______合成，采用科学的配方及先进的生产工艺生产。
参考答案：不饱和树脂
. So far nobody has claimed the money__________in the library.
A．discovered
B．to be discovered
C．discovering
D．having discovered
We have lots of food ______ dinner. [ ]
A. in
B. at
C. for
D. on
