单选题 To ______ is to save and protect, to leave what we ourselves enjoy in such good condition that others may also share the enjoyment.

【正确答案】 A
【答案解析】保护就是保存并保护，或是留下，在境遇好时，我们自己在享受的和他人可能也在分享的东西。A选项：保护，保存，保留。B选项：设想，认为。C选项：转变，转化。D选项：筹划，设法做成某事。