入境报检时凡实施安全质量许可卫生注册强制性产品认证民用商品验证或其他需经审批审核的货物应提供有关审批文件A

按80/20规则分类，重点供应商是指（)。
A．数量20%的占价值20%
B．数量20%的占价值80%
C．数量80%的占价值20%
D．数量80%的占价值80%

In paragraph 5, the author describes an experiment in which water is poured into various glasses in order to
A．show how children approach difficult problems
B．recommend an experiment that can be done at home
C．give a variation on a classic experiment by Piaget
D．suggest an activity for parents and children

气体流经渐缩喷管而射向真空，则流速和流量的变化分别为（)。
A．减小，不变
B．增大，减小
C．增大，不变
D．减小，增大

下列关于玻璃水银温度计，叙述不正确的为（)。
A．水银的膨胀系数比有机液体的小
B．水银与玻璃无粘附现象
C．在200℃以下为线性刻度
D．测温下限可达-150℃

Opponents of the guidelines say that______.
A．the guidelines are not in the best interests of terminally ill patients
B．the guidelines ignore the welfare of the patients' relatives
C．the guidelines do not provide adequate safeguards against uncaring doctors
D．the guidelines have caused uncertainty and confusion among doctors

The principles of writing business letters are （).
A．correct grammar
B．no punctuation
C．appropriate layout
D．suitable style

Many people__ their lack of knowledge as soon as they start talking.
A．display
B．dispatch
C．disregard
D．dissolve

To deliver a story, you should do all of the following EXCEPT ______.
A．capturing the audience's attention right at the beginning
B．making as few gestures as possible
C．appealing to the audience's sense of sight
D．monitoring feedback from the audience