According to the passage, _____.
A、we should not worry about the transition of the Earth’s magnetic field
B、the Earth’s magnetic field will not change for at least 2000 years
C、the Earth’s magnetic field has decreased its strength rapidly
D、the transition of the Earth’s magnetic field can be controlled by modern science
查看答案
正确答案
试题解析
第五段一开始:无论新的研究发现什么,公众也不必为此惊慌。即使是磁场转移已经开始,它可能需要2000年才能完成。