单项选择题

Customer service stands out as the area where WestNet falls most behind, with 43.8 percent of its users in the survey saying "its security does not come______".

A．up to scratch
B．up in the air
C．up to date
D．up to the minute
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单项选择题
This passage is extracted from an article written by an expert on ______.
A．surgical equipment
B．heart diseases
C．materials for surgical implants
D．mechanical valve manufacturing
单项选择题
According to the passage, a greater fraction of rainfall on the globe we live comes from______.
A．the evaporated and transpired water from the earth itself
B．the wet atmosphere above in the sky
C．returning rainfall to the atmosphere
D．the mixture of wet and dry air
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