题目：30． In order to solve the problem of water shortage，we’ have to________．
a． make use of sea water on the earth
b． save as much fresh water as possible
c． reuse the water from large cities
d． stop people from，using water
e． only use the 3% of the water on the earth
A．a and e
B．a，b and c
C．b，c and d
D．a，b and d
喵查答案：B
30.B【解析】由短文描述的内容可知a、b、c都是解决措施，故B是最佳答案。
