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【单选题】
对50名40岁以上的山区健康男子测量血压（mmHg），用t检验与全国正常男子资料进行比较。按α=0.05的检验水准，自由度为（）A.
v=40
B.
v=43
C.
v=46
D.
v=48
E.
v=49
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A.
occurred
B.
wilted
C.
stooped
D.
melted
【单选题】The greatest change Mrs. Mallard might experience from her husband’s death is that .
A.
She would become a widow with nobody to depend on
B.
She would relieve herself from the bondage their marriage gave her
C.
She would enjoy an isolated life and live only for herself
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A.
Opinions
B.
facts
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A.
fact
B.
opinion
【单选题】The greatest change Mrs. Mallard might experience from her husband's death is that ______.
A.
B.
C.
C
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