It is well known to us all that in China pigeons stand for peace. However, in India the wheel in its national flag is also a _______of peace.
| A．example | B．sign | C．mark | D．symbol |
Some researchers believe that many patterns of nature are rules of their own and not affected by natural selection．
| A．making | B．breaking | C．following | D．bending |
—Can I look at the menu for a few seconds before I decide?
—Of course．，sir．
| A．Take your time | B．It doesn’t matter |
| C．Enjoy yourself | D．Help yourself |
Only whenin the afternoonable to leave.
| A．the match was over; they were | B．was the match over; were they |
| C．was the match over; they were | D．the match was over; were they |
There are 51 students in Class Three, _____ failed in the test.
| A．all of which | B．all of them | C．none of whom | D．none of them |
______ happened to be no one in that house when the typhoon hit the area.
| A．It | B．There | C．This | D．That |