30．Teachers' Day is a festival based more on the ________ aspect than the material level, and the stress on gifts has caused it to lose its original meaning.
A．physical B．moral
C．cultural D．spiritual
[解析]spiritual 精神的。句意：教师节是一个更多以精神而不是以物质为基础的节日，并且礼物的压力已使它丧失了最初的意义。
[答案]D
31．As is often pointed out, knowledge is a twoedged weapon which can be used______ for good or evil.
A. similarly B. properly
C. equally D. widely
[解析]similarly 相似地，类似地；properly 合适地，恰当地；equally 相等地，等同地；widely 广泛地。句意：正如经常指出的那样：知识是一把双刃剑，它既可以用于善，又可以用于恶。由句意可知C项正确，指“它用于善、恶的几率是等同的”。
[答案]C
