【题目】The manager，knowing his factory's products were poor in________，decided to give his workers further training.
A.quantity
B.amount
C.deal
D.quality

【答案】D
【解析】A．quantity数量；B．amount数量，量，只用于不可数名词；C．deal 交易，份量；D．quality质量；句意：经理知道他工厂的产品质量差，于是决定对工人进行进一步的培训。根据句意，故选D。