单选题 He collects ______ of all kinds of rocks and minerals.
A. specimens B. timbers C. serpents D. trunks

【正确答案】 A
【答案解析】[解析] (specimen标本)。句意为：他搜集各种岩石和矿石的标本。B．timber木材；C．serpent大蛇，毒蛇；D．trunk树干。