单项选择题You can send small packets by airmail or by surface mail. European destinations have a _____ time of 3 days for airmail and 2 weeks for surface mail.
单项选择题There isn’t enough space, I want you to clean _____ all the old files.
单项选择题What is the size of the new module
单项选择题Which statement is NOT true according to the recording .
单项选择题The new module is versatile, because