—What can we do to help others?

—We can ______ a food bank to help hungry people.

A．put up

B．set up

C．pick up

D．show up

下列程序的运行结果是 【13】 。 x="计算机等级考试" Y="" L=LEN(X) DO WHILE L＞=1 Y=Y+SUBSTR(X，L-1，2) L=L-2 ENDDO Y