Greenhouse phenomena would cause ______ rise in sea levels worldwide and change ______ weather on the earth.
| A．a; the | B．the; 不填 | C．a; 不填 | D．不填; the |
_____ turned out that this material was neither silk nor cotton.
| A．That | B．It | C．What | D．Which |
It is believed to _____ over by sandstorms from AD 200 to AD 400.
| A．gradually cover | B．be gradually being covered |
| C．have been gradually covered | D．be gradually covered |
Many people are not fully aware of the damage that it does to their health. This is ____ we chose this picture as our logo.
| A．that | B．because |
| C．why | D．for which |
We want to shock people into ____ that many smokers die all too soon from illness and diseases _____ smoking.
| A．being realized; relating to | B．realizing; related to |
| C．realizing; relating and | D．being realized; related and |
George Gould too visited the tomb, ____ a high fever the next day.
| A．only to catch | B．caught |
| C．being caught | D．catching |