题文
If you___bright sunlight___dry wood with a magnifying glass,it will start burning
| A．expose;to |
| B．concentrate;on |
| C．aim;at |
| D．focus;on |
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If you___bright sunlight___dry wood with a magnifying glass,it will start burning
| A．expose;to |
| B．concentrate;on |
| C．aim;at |
| D．focus;on |
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