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【单选题】
绒毡层是()中重要结构。A.
胚囊
B.
胚珠
C.
花药壁
D.
花粉母细胞
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【简答题】A．Pain-relievers have little harm. B．Pain-relievers can be addictive. C．Heroin and are addictive. D．Not all people who try to get pain-relievers have an ache.
【单选题】根据下面短文内容，回答题。 Pain All of us have felt pain. We have cut ourselves. We have been burned. Or we have had headaches. Some of us suffer pain rarely pain rarely. __________ (46) Pain can take complete con...
A.
And others have painful attacks all the time
B.
These signals travel from nerve cells in the injured area， up the spinal cord （ 脊髓 ） to the brain， and back down again
C.
It tells us that we are injured and should do something about it
D.
They knew little about the process of pain itself
E.
The other message moves at a speed of only one meter a second，
F.
And they send the second， slower message of pain to t.he brain
【单选题】We can safely conclude from the text that ______.
A.
vertebrates feel pain because they have vertebrae
B.
animals do not experience pain although they are equipped with all the necessary neurological structures
C.
animals do not feel pain because they haven't developed fore-brains yet
D.
none of the above
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