The conventional view    that the Mars’ atmosphere is very poor because the planet lacks a magnetic field.
A．coversB．holdsC．possessesD．contains
B
考查動詞：A. covers涉及，B. holds持有，抓住C. possesses 擁有，D. contains含有，句意是：通常的看法認為火星的大氣很差，因為這個行星缺乏磁場。選B。
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