I don’t really work here; I ______ until the new secretary arrives.

A．just help out

B．have just helped out

C．am just helping out

D．will just help out

与模拟式仪表相比，数字式仪表的优点有（）。

A.灵敏度、准确度高

B.显示清晰

C.过载能力强

D.携带、使用更简单