24. People who work in a doctor’s office must exercise ________ and keep all patient information confidential.
(A) irrigation
(B) discretion
(C) propellant
(D) evacuation

在醫生辦公室工作的人必須謹慎行事，並對所有患者的資訊保密。
A irrigation (n)灌溉
B discretion (adj)謹慎的
C propellant (n)推進物、推進者
D evacuation (n)撤退

(A) irrigation
the practice of supplying land with water so that crops and plants will grow
灌溉
Dirty irrigation water can spread animal pathogens to fruits and vegetables.

(B) discretion
the right or ability to decide something
決定權
Students can be expelled at the discretion of the principal (= if the principal decides it).
I leave the decision to your discretion (= for you to decide).
the ability to behave without causing embarrassment or attracting too much attention, especially by keeping information secret
慎重，謹慎；守口如瓶
"Can you trust him with this?" "Yes, he's the soul of discretion (= he will not tell other people)."

(C) propellant
an explosive substance or fuel that causes something to move forwards
推進劑，發射劑

(D) evacuation
the act of moving people from a dangerous place to somewhere safe
撤離，撤出，疏散，轉移
The evacuation of civilians remains out of the question while the fighting continues.
The first evacuations came ten days after the disaster.
the act or process of emptying something of its contents, especially the bowels
排泄，清空
Fear can cause an involuntary evacuation of the bowels.
A laxative stimulates the evacuation of intestinal contents.

資料來源：劍橋辭典