单项选择题

The word "it" in the sentence "seawater directly beneath freshly formed sea ice has a higher salinity than it did before the ice appeared." (paragraph 4,line 4) refers to______.

A．seawater
B．surrounding water
C．the salt in the water
D．the water
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The old copy of the software______.
A．is internet based
B．is telephone based
C．is well accepted
D．is well programmed
单项选择题
The word they (Line 5, Para. 4) refers to______.
A．parents
B．schools
C．activities
D．students
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