阿摩線上測驗
13. Humans produce ______ two million blood cells each second, derived from a relatively small pool of haematopoietic stem cells.
(A) leisurely.
(B) intensely.
(C) roughly.
(D) precisely.
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統計： A(0), B(1), C(0), D(0), E(0) #3450159
統計： A(0), B(1), C(0), D(0), E(0) #3450159
