Scientists think that there has been life on Earth for _______ years.
| A. millions |
B. millions of |
C. million of |
D. million |
相关试题
Please open a window _________ turning on air conditioning.
| A．instead of | B．instead | C．not | D．rather |
In those days ,books could only be produced one at a time _____________.
| A．in hand | B．with hand |
| C．by hand | D．by hands |
Food safety is important. Rules _____ to stop people from food pollution.
| A．must make | B．must be made | C．mustn’t make | D．mustn’t be made |
—Why don’t we start a school magazine on line?
—________
| A．Sounds like a good idea! | B．It doesn’t matter. |
| C．Thanks for your help. | D．Sorry to hear that. |
means _________
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