单项选择题
A．so B．various C．different D．such
A．by learning from Indian their way of doing things B．by raising questions time and again C．as quickly as we can D．as slowly as we can
A．Fluctuations in Weather Patterns. B．Magnetism and the Sun Spots. C．The Size and Number about the Earth’s. D．Livingston’s New Theory about the Earth’s Climate.