II. Укажите какие из данных утверждений соответствуют содержанию текста.
1. The conductive properties of semiconductors may be modified.
2. A donor atom takes weakly – bound valence electrons off the material.
3. Semiconductors doped with donor impurities are called p-type.
4. The concentration of dopant introduced to an intrinsic semiconductor determines its electric properties.
5. Doped semiconductors have conductivity levels comparable to metals.
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