在采购方式中，可能出现投标人靠降低工程、货物和服务质量来降低价格的采购方式 是（）采购。 A．招标 B．议价 C．询价 D．定价
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某采矿企业2010年6月开采锡矿石50000吨，销售锡矿原矿40000吨、锡矿精矿100吨，锡矿的选矿比为1：15，锡矿资源税适用税额每吨6元。该企业6月应纳资源税（）元。
勘察合同采用定金担保，发包人向勘察人支付预计勘察费总额的（）作为定金。 A．10% B．15% C．20%
The author indicates that autism researchers should not focus on ______
A. trying to use IQ test methods which are suitable for autistic children to get reasonable scores.
B. asking the parents of autistic children to find abilities such as reading in their children.
C. finding ways to teach autistic to communicate and engage with strangers.
D. encouraging autistic children to make use of their own intelligence in practice.
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