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【单选题】
氯胺酮椎管内镇痛的机制是A.
通过抑制环氧化酶活性，干扰前列腺素的合成产生止痛作用
B.
通过对阿片受体的弱激动作用和对去甲肾上腺素及5－羟色胺再摄取的抑制发挥止痛作用
C.
通过激动体内的阿片受体产生强烈的镇痛作用
D.
阻断脊髓内N－甲基－D－酸(NMDA)受体和竞争性地与阿片受体结合，从而产生镇痛作用
E.
通过对阿片受体的弱激动作用和对去甲肾上腺素及5－羟色胺再摄取的抑制发挥止痛作用
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【单选题】WALL-E becomes quite smitten with EVE. He shows her his movie and offers her all his treasures. What does she do when he offers her the plant?
A.
She tries to eat it.
B.
She throws it against the wall.
C.
She starts emitting a high pitched siren noise.
D.
She puts it inside her body and shuts down.
【单选题】She ____ all the job offers and plans to be a housewife.
A.
turn out
B.
turn in
C.
turn down
D.
turn up
【单选题】She ____ all the job offers and plans to be a housewife.
A.
turn out
B.
turn in
C.
turn down
D.
town up
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【单选题】My cousin is a helpful girl, she often ________ others.
A.
gets help from
B.
offers to help
C.
shares things with
D.
says bad things about
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