Green is usually regarded as a __________ of life while red stands for joy and victory.
A. symbol B. sign C, mark D. signal
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 |
A good article should not only be rich in the use of language, but also it ought to be ________ organized.
| A．personally | B．faithfully | C．unexpectedly | D．logically |
I’m sorry you’ve been waiting for so long, but it’ll still be some time _______ Brian gets back.
| A．since | B．after | C．when | D．before |