Green house phenomena would cause _____ rise in sea levels worldwide and change _____ weather on the earth.

1. A.
   a; the
2. B.
   ／; the
3. C.
   a; ／
4. D.
   a; a

Green house phenomena would cause _____ rise in sea levels worldwide and change _____ weather on the earth.

[　　]

A．a; the　　　B．／; the

C．a; ／　　　D．a; a