The text is too difficult. The explanation of our teacher will help make it easy ________.
| A．to understand | B．to be understood |
| C．understood | D．understanding |
I always ___________ on life when listening to Beethoven's symphonies.
| A．react |
| B．recover |
| C．reflect |
| D．respond |
As a result of destroying the forests, a large of desert __________ covered the land.
| A．number; has |
| B．quantity; has |
| C．number; have |
| D．quantity; have |
Plastic parts can __________ metal ones in many machines. But they don't last long.
| A．substitute with |
| B．be replaced with |
| C．take the place of |
| D．in place of |
Large quantities of china made in Dehua __________ to the US and Europe.
| A．has exported |
| B．will export |
| C．is exported |
| D．are exported |
-It's said that scientists have made __________ big breakthrough in the cancer treatment.
-If so, many people can have been brought back to __________ life ！
| A．a; / |
| B．/；a |
| C．the; the |
| D．a; the |