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【单选题】
--- Can you tell me how many study groups there are in a class? --- Generally speaking, a class often ___ 8 study groups, each with 7 group members.A.
is consisted of
B.
is made of
C.
made up of
D.
consists of
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反馈参考答案：
举一反三
【单选题】The renal pelvis is the
A.
capillaries that filter the blood
B.
upper part of the ureter
C.
minor calyx
D.
renal capsule
【单选题】The renal sinus is
A.
the innermost layer of kidney tissue
B.
a conical structure located in the renal medulla
C.
an internal cavity lined by the fibrous capsule and located inside the hilum
D.
a large branch of the renal pelvis
【单选题】The renal pelvis is
A.
A funnel-shaped tube, wide above and' narrow below
B.
Formed by the junction of two or three major renal calyces
C.
Situated partly inside the renal sinus
D.
Situated partly outside the renal sinus
E.
All the above are true
【单选题】What are the functions of secondary metabolites?
A.
Used to attract animals to pollinate the plant and to disperse its seeds
B.
Protecting the plant from herbivores such as insects
C.
Used to derive medicine
D.
All of the above
【简答题】How does the author explain the unidirectional flow of metabolites?
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