30.一號貨艙的部分穀子被老鼠吃掉。
(A)The grain of No.1 hold is partly eaten by worms.
(B)The grain of No.1 hold is partly eaten by rats.
(C)The grain of No.1 hold is partly eaten by parasites.
(D)The grain of No.1 hold is partly eaten by pests.

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統計： A(0), B(2), C(1), D(3), E(0) #2401586