The conventional view that the Mars’ atmosphere is very poor because the planet lacks a magnetic field.
A. covers
B. holds
C. possesses
D. contains
网友回答
A. covers
(答案→)B. holds
C. possesses
D. contains
解析：考查动词：A. covers涉及，B. holds持有，抓住C. possesses 拥有，D. contains含有，句意是：通常的看法认为火星的大气很差，因为这个行星缺乏磁场。选B。