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参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】Obtaining Drinking Water from Air Humidity Not a plant to be seen，the desert ground is too dry．But the air contains water，and research scientists have found a (51) of obtaining drinking water from a...
A.
who
B.
where
C.
when
D.
which
【单选题】在计算数据时，当有效数字位数确定以后，应将多余的数字舍去。设计算结果的有效数字取4位，则下列正确的取舍是（）
A.
4.32749→4.328；
B.
4.32750→4.328
C.
4.32851→4.328
D.
4.32850→4.329