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.

A.   may include melting the polar ice caps and a rising sea level

B.    may include the melting of polar ice caps and the rising sea level

C.   may include polar ice caps that are melting and sea levels that are rising

D.   include melting the polar ice caps and sea levels that are rising

E.    include melting of the polar ice caps and a rise in sea level

我记得石林说过语气词不能丢啊,may不是吗

情态动词确实最好不要改变或缺失，但是不绝对。