无盐低钠饮食要求每日钠的入量低于（ ）g。
参考答案：0.5
13. He was absorbed ____ a book and didn’t hear your repeated call.
A．to
B．in
C．with
D．At
As a child, Jack studied in a village school，__________is named after his grandfather．
A which B where C what D.that
