题目内容
（请给出正确答案）
A．By studying the signs around them with eyes and brains.
B．By changing the weather.
C．By controlling the weather.
D．By listening to others' advice.
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A．By using satellite images, maps, etc.
B．By studying specific fanning methods.
C．By studying the variation of human population.
D．By analyzing the quality of crops.
A．By talking to everybody.
B．By studying American history.
C．By putting a number on it.
D．By making a guess at this.
A．By using satellite images, maps, etc.
B．By studying specific farming methods.
C．By studying the variation of human population.
D．By analyzing the quality of crops.
A．By learning English alone.
B．By learning English hard before test.
C．By studying at her spare time.
D．By learning a little regularly.
A．By using satellite images, maps, etc.
B．By studying specific {arming methods.
C．By studying the variation of human population.
D．By analyzing the quality of crops.
A．By observing the ordinary ones that have already erupted.
B．By studying the larger part of a volcano hidden underground.
C．By tapping their potential of imagination.
D．By resorting to past information and modem technology.
【C13】
A．by no means
B．partly
C．insufficiently
D．completely
A．By e-mail.
B．By sending her fax.
C．By calling her.
D．By visiting her.
A．By attending lectures.
B．By surfing on the internet.
C．By watching TV programs.
D．By preparing for a presentation.
