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【多选题】
金属材料分为（）两类.A.
黑色金属材料
B.
有色金属材料
C.
黄色金属材料
拍照语音搜题，微信中搜索"皮皮学"使用
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举一反三
【单选题】She knows a lot about China as she has been to China ________.
A.
for the forth time
B.
four times
C.
a fourth time
D.
for four times
【单选题】What is known about Prof. Grant?
A.
She has been to Mexico.
B.
She assigns long research papers.
C.
She teaches cultural anthropology.
D.
She collects ancient relies.
【单选题】听力原文：Susan is fluent in Spanish now that she has been to Mexico. What do we know about Susan?
A.
She learned Spanish in America.
B.
She doesn't know Spanish.
C.
She improved her Spanish in Mexico.
D.
She knew Spanish before going to Mexico.
【简答题】某地为推广先进企业的生产经营管理经验，对效益最好的几个企业进行调查，这种调查是属于（ ）。
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