单项选择题
Good manners may be varied（） cultural backgrounds.
A.since B.because C.due to
单项选择题 一Hello，thisisStevenSmith.Nicetohearyourvoiceagain.Hi，Mr.Smith.thecoverageofyourfreightforwardingbusiness？-（）.
单项选择题 -Ithinkabusstopadvertisementisaverywisechancetopromoteourproducts.-（）.
单项选择题 -Youareright.Howdoyouanalyzeourweaknesses？一weputlessemphasisontheoveralldesign.（）
