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【简答题】
听录音．根据情景会话选出正确答案。 ( ) 1. a. About the weather. b. About the temperature. ( ) 2. a. It's 35 degrees. b. It's 35 degree. ( ) 3. a. It's hot. b. It's cold.
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反馈参考答案：
举一反三
【单选题】The main theme of the talk is about
A.
noise-control technology.
B.
noise in factories.
C.
noise-control regulations.
D.
noise-related effects.
【多选题】Noise is a term used for factors that interfere with the exchange of messages, including. Noise is inevitable
A.
external noise
B.
physiological noise
C.
psychological noise
D.
semantic noise
【单选题】下列命题中正确的是：
A.
n阶方阵A的n个特征值互不相等，则A与对角阵相似.
B.
n阶方阵A与B的特征值相同的充分必要条件是A与B相似.
C.
若A和B相似，则它们必相似于同一对角阵
D.
实对称矩阵不一定可对角化
【多选题】There are different kinds of noise
A.
Physical noise
B.
Physiological noise
C.
Psychological noise
D.
semantic noise
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