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如何区别绿柱石与电气石?

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从物理性质上区别以下矿物对:橄榄石-绿帘石、普通辉石-普通角闪石、正长石-斜长石

—What nationality _ you?—I _ Chinese.

A.are/is
B. are/am
C. is/am

—What _ your nationality?— I _ Korean.

A. are/is
B. is/am
C. is/are

My sister is _ student, and my brother is _ engineer.

A. a/an
B. a/a
C. a/the