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
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—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
—___ is the boy?—He is my brother.
A. How
B. What
C. Who