Q19:
Possible long-term consequences of the “greenhouse effect,” the gradual warming of the Earth’s climate, may include melting the polar ice caps and a rising sea level.
may include melting the polar ice caps and a rising sea level
may include the melting of polar ice caps and the rising sea level
may include polar ice caps that are melting and sea levels that are rising
include melting the polar ice caps and sea levels that are rising
include melting of the polar ice caps and a rise in sea level
正确答案是E，但是我选的B，不知道为什么。请指点，谢谢！ | 
