Recently the Ministry of Environmental Protection issued a circular saying that China may adopt flexible working hours and stop school classes_____the highest air pollution warnings.
| A．for fear of | B．in terms of | C．on top of | D．in case of |
The doctor came out and said the operation was well finished. The parents smiled ________ and the nervousness disappeared from their faces.
| A．in relief | B．in danger | C．in peace | D．in reality |
Rainforests _______ and burned at such a speed that they will disappear from the earth in the near future.
| A．cut | B．are cut | C．have been cut | D．are being cut |
Smile is recognized as a/an _________ language, which can be understood by people all over the world.
| A．artificial | B．technological | C．universal | D．analytical |
The conference has been held to discuss the effects of tourism _______ the wildlife in the area.
| A．on | B．in | C．at | D．of |
Effective measures should be taken to ______ the rare species _______ being over-killed by human beings.
| A．keep; against | B．prevent; from |
| C．stop; against | D．protect; from |