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【单选题】
下列情况1排出阀;2吸入阀;3油温升高;4油温降低;5发生困油现象;6发生“气穴”现象,会使齿轮油泵排压升高的是 。A.
①③⑤
B.
①④⑤⑥
C.
①
D.
①④
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【简答题】Anthropologists agree that our primitive ancestors who inhabited the tropics probably have natural protection against the sun.
【单选题】Present human being respond to chronic stress in the same way as our ancestors did, why do we get fat while our ancestors didn’t?
A.
Because our ancestors didn’t have relationship troubles.
B.
Because our ancestors didn’t have Route 66.
C.
Because our ancestors didn’t have so much food at disposal.
D.
Because our ancestors didn’t have a large food storage unit.
【简答题】It ’s excited that so many people like that exciting TV program. A B C D _____________
【单选题】Our taste for fat and sugar appears to have______ from our ancestors.
A.
carried
B.
stemmed
C.
succeeded
D.
rooted
【单选题】．No one knows exactly when our ancestors started talking，but new evidence suggests _______might have happened a long time ago．
A.
which
B.
what
C.
it
D.
they
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