Question

 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

Answer 1

 B�？疾槎陶Z(yǔ)動(dòng)詞。 pack up整理；把…打包，bring up提出；教育；養(yǎng)育；嘔出；take up拿起；開(kāi)始從事；占據(jù)(時(shí)間,地方)，build up逐漸積聚，集結(jié)；逐步建立；增進(jìn)，增強(qiáng)。在本句中build up fat stores表示積累脂肪儲(chǔ)存。

【句意】熊在整個(gè)夏天到秋天積累脂肪，為了在冬天度過(guò)冬眠期。