British scientists have produced ___ they believe is the world's smallest Christmas card．
| A．which | B．who | C．that | D．what |
There is a real possibility that these animals could be frightened, ______ a sudden loud noise.
| A．being there | B．there being | C．should there be | D．there was |
Understanding the cultural habits of another nation, especially __________ containing as many different subcultures as the united states, is very difficult.
| A．one | B．that | C．some | D．the one |
解析：one 代指一个国家，他是泛指
The boy was led _______while crossing the road.
| A．in the hand | B．by his hand | C．by hand | D．by the hand |
______ has taken away my notebook?
| A．Which of you | B．Who of you | C．Which you | D．Who you、 |
Columbus is known for the great discovery _____________ a new land—America.
| A．making up | B．making into | C．make from | D．made of |