皮皮学，免费搜题
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【单选题】
ABO血型系统的天然抗体主要是A.
IgG
B.
IgA
C.
IgM
D.
IgD
E.
IgE
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参考解析：
知识点：
皮皮学刷刷变学霸
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【单选题】听力原文：M: When shall we start? F: Now it's 8: 30. We'll start half an hour later. When will they start?
A.
At 8:00.
B.
At 8:30.
C.
At 9:00.
【单选题】Mr Brown is an experienced doctor. He is always as cool as a cucumber __________ faced with emergency.
A.
because
B.
before
C.
when
D.
after
【简答题】We realized from this experience _______ when faced with er, we should stay calm.
【单选题】What should we do when faced with a contrastive situation?
A.
Do nothing
B.
Act flexibly
C.
Act blindly
【单选题】若X是二叉中序线索树中一个有左孩子的结点,且X不为根,则x的前驱为( )
A.
X的双亲
B.
X的右子树中最左的结点
C.
X的左子树中最右结点
D.
X的左子树中最右叶结点
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