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【单选题】
设函数 则当 时, 是( ).A.
无穷小
B.
无穷大
C.
既不是无穷小，也不是无穷大
D.
极限存在但不是0
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【简答题】The Immune System The human body often takes care of itself without the person who owns the body knows what is happening. The body takes care itself through its immune system. The immune system is in ...
【单选题】Ordinary soft drinks enter human body through stomach _____ alcohol goes directly into the blood system.
A.
until
B.
while
C.
as
D.
before
【单选题】The human circulatory system ___ body cells ___ food and oxygen.
A.
is supplied … with
B.
supplies … to
C.
supplies … with
D.
is supplied … for
【简答题】圆柱是由( )个面围成的,圆柱的上下两个面叫做( ),圆柱周围的面叫做( )
【简答题】圆柱的上下两个面叫做圆柱的( ),圆柱的底面是两个( )的圆,周围的面叫做圆柱的( )。
【简答题】圆柱的上下两个面叫做______，两个底面之间的距离叫做圆柱的______．
【单选题】Which system in the human body regulates long term processes, such as fluid balance, growth, and sexual development?
A.
(A) endocrine system
B.
(B) reproductive system
C.
(C) integumentary system
D.
(D) circulatory system
E.
（E) lymphatic system
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