单选题According to the passage, the Earth’s magnetic field has _____.Abegun to change in the opposite directionBbeen weakening in strength for a long timeCcaused the changes on the polaritiesDmisguided many a man and animal
单选题
According to the passage, the Earth’s magnetic field has _____.
A
begun to change in the opposite direction
B
been weakening in strength for a long time
C
caused the changes on the polarities
D
misguided many a man and animal
参考解析
解析：
文章第一段：《纽约时报》上周报导地球磁场严重减弱开始于150年前。磁场保护着我们的星球，为许多生物指引方向。
文章第一段：《纽约时报》上周报导地球磁场严重减弱开始于150年前。磁场保护着我们的星球，为许多生物指引方向。
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