Science and technology is changing fast nowadays. I bought this MP3 player at the beginning of this year but now it's out of ________.
| A．date | B．order | C．use | D．sight |
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The danger of 
HINI was real, especially in the beginning, little was known about the new disease.
| A．if | B．because | C．when | D．before |
For those who don’t have to safe water, life is a constant struggle.
| A．approach | B．access | C．way | D．passage |
All over the world the mobile phone has leaped from being an impossible luxury in the early 1980s to most people would now call a necessity.
| A．which | B．that | C．what | D．when |
The Washington-Beijing relationship was now about more than trade. It also covered climate and other matters of international .
| A．standard | B．concern | C．expectation | D．chance |
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