17.Bears _______ fat stores throughout the summer and fall to have enough energy to last them through their sleep. 　　　
(A)pack up
(B)build up
(C)bring up
(D)take up

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統計： A(0), B(1), C(0), D(0), E(0) #987647

詳解 (共 1 筆)

#1202033

考动词短语，必考题，看似无头绪因为很难记住意思，其实这类动词短语大多很生活化，只有平时多用才行；选B build up =make sth gradually become bigger。

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