单项选择题

A．Much smaller than a human hair.
B．A little bigger than the bacteria.
C．One billion times smaller than crystals.
D．As big as a virus or a cell.
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单项选择题
A．The representatives are keeping silence for the victims and the injured.B．The New Zealanders are observing the live TV programmes.C．The flags on government buildings are flying at half-mast.D．The television and radio stations are broadcasting the service.
A．The representatives are keeping silence for the victims and the injured.
B．The New Zealanders are observing the live TV programmes.
C．The flags on government buildings are flying at half-mast.
D．The television and radio stations are broadcasting the service.
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