下图画的新疆古老的引水工程是

A．引水渠

B．灌溉

C．坎儿井

D．水井

In most western countries, on April Fool’s Day, people often play __ ___ trick on each other; children especially have great ______ fun.

A．a; a

B．the; the

C．/; a

D．a; /