阿摩線上測驗
23. Because the tiny organisms could not be seen with the naked eye, the scientist had to use a ________ to detect them.
(A) quotation
(B) microscope
(C) helicopter
(D) parachute
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統計： A(2), B(17), C(3), D(2), E(0) #3929888
統計： A(2), B(17), C(3), D(2), E(0) #3929888
