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【单选题】
Mean reversion refers to the observation thatA.
stock prices overact to news announcements.
B.
stocks prices are more volatile than fluctuations in their fundamental value would predict.
C.
stocks with low returns are likely to have high returns in the future.
D.
stocks with low returns are likely to have even lower returns in the future.
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【简答题】麻黄 科裸子植物输水组织为 ,花具 单 性 ,多数裸子植物的输水组织为 , 花的特征为 无 花被 。
【简答题】_________ 是被子植物的输水组织, _________ 是蕨类植物和裸子植物的输水组织。
【多选题】下面哪些是我们在设计调查问卷时应该注意的？
A.
Do not collect unnecessary information.
B.
You should try putting the questions to a classmate before beginning the full survey, and be ready to modify any that were not clear.
C.
Closed questions are easier to process, but open questions will collect a wider range of responses.
D.
Keep questions clear and simple, and not too personal.