2014年6月英语四级作文真题附范文(第2套):A Beautiful City in China

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As listed in Table 1, although the surface area of the supported catalyst is lower than that of Fe3O4@MCM-41 and MCM-41, it isrelatively higher compared to that of Fe3O4. The decrease in the surface area may be ascribed to the introduction of active species. The acceptable surface area of the supported catalyst is believed to be beneficial to the dispersion of active species and catalytic performance.