Lead time is an important concept of a person's culture that is ______.
A．learned casually and without planning
B．vague because its rules have not been stated technically
C．not taught formally in the classroom
D．only learned through experience

相关问题推荐

• Why does the author say high consumption is a mixed blessing？
  A．Because poverty still exists in an affluent society.
  B．Because moral values are sacrificed in pursuit of material satisfaction.
  C．Because over-consumption won't last long due to unrestricted population growth.
  D．Because traditional rituals are often neglected in the process of modernization.

  查看答案

• According to the passage, all of the following are objectives of the THEMIS mission EXCEPT:
  A．predicting variations in the flux of electrons in Earth's outer radiation belt
  B．understanding how individual components of the substorm interact
  C．guaranteeing the success rates of future space missions
  D．investigating when and where substorms begin
  E．understanding how substorms power the auroras

  查看答案

• It can be inferred from the passage that ______.
  A．human spiritual needs should match material affluence
  B．there is never an end to satisfying people's material needs
  C．whether high consumption should be encouraged is still an issue
  D．how to keep consumption at a reasonable level remains a problem

  查看答案

• The main purpose of the passage is to
  A．explain why it is important to invest in space research
  B．explain how magnetic substorms interfere with satellite communications
  C．define magnetic substorms and identify a recent scientific experiment to study them
  D．compare two alternative approaches to the study of magnetic substorms
  E．demonstrate that unmanned probes are the best way to conduct research in space

  查看答案

• According to the passage, consumerist culture ______.
  A．cannot thrive on a fragile economy
  B．will not aggravate environmental problems
  C．cannot satisfy human spiritual need
  D．will not alleviate poverty in wealthy countries

  查看答案