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临界闪烁频率(cff)是人眼对于闪烁光源能够分辨出它在闪烁的最高频率(以Hz计)．超过cff的频率，即使光源实际是在闪烁的，而人看起来是连续的(不闪烁的)．一项研究旨在判定cff的均值是否与人眼的虹膜颜色有关，所得数据如下： [ 临界闪烁频率(cff) 虹膜颜色 棕色 绿色 蓝色 26.8 26.3 26.4 29.1 25.7 29.4 27.9 24.8 24.2 27.2 28.3 23.7 25.7 28.0 29.9 25.0 24.5 26.9 28.5 试在显著性水平0.05下，检验各种虹膜颜色相应的cff的均值有无显著的差异．设各个总体服从正态分布，且方差相等，不同颜色下的样本之间相互独立。
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举一反三
【单选题】After working all day, he was so tired that he was in no __ to go to the party with us A)taste B)mood C)sense D)emotion
A.
taste
B.
mood
C.
sense
D.
emotion
【单选题】The old man runs very fast _____ he were a young man.
A.
because
B.
for
C.
since
D.
as if
【多选题】Part III Cloze(1.5*10=15 points) Section A In this section, you will read a story about the old man and the old cat. Please fill in the blanks with the given words. 在本节中,请阅读 the old man and the old c...
A.
like
B.
old
C.
angry
D.
strong
E.
mouse An old man has a cat. The cat is very 41 , too. He runs very quickly. But his teeth are bad. One evening, the old cat sees a little 42 . He catches it, but he can’t eat it because his teeth are not 43 enough. The mouse runs away. The old man is very 44 . He beats his cat. He says: “You are a fool cat. I will punish you!” the cat is very sad. He thinks : “When I was young, I worked hard for you. Now you don’t 45 me because I’m too old to work. You should know you are old, too.”
【简答题】One Day, Mr Black sees a sweater in a shop window. He decides to buy it because it is very cheap. When she gets home, he put the sweater on. It fits ( 适合) him very well and he is very happy. In the af...
【简答题】He went very fast. ____、 ____he runs!
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