使用起重机作业时必须严格执行各项规程，下列说法错误的是（）。
A、作业前必须了解现场工作环境C
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_______isafactthatEnglishisbeingacceptedasaninternationallanguage.
Thebasicunitinthestudyofmorphologyis______.
翻译：Wesendyouabrochureonthevariouskindsofbicyclenowavailableforexport
____yourinformation,wehavereceivedacrowdofenquiriesfrombuyersinotherdirections.()
Totrade____thepeopleofalleountries____thebasisofequalityandmutualbenefitisourestablishedpolicy.
