A NASA experimental jet , the X-43A,flew at a world –record speed ---11,260 kilometres an hour on November 17.This speed is __ as that of sound.
| A．astentimesfast | B．tentimessofast | C．tentimesasfast | D．tentimesfaster |
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A NASA experimental jet , the X-43A,flew at a world –record speed ---11,260 kilometres an hour on November 17.This speed is __ as that of sound.
| A．astentimesfast | B．tentimessofast | C．tentimesasfast | D．tentimesfaster |
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