证券公司客户信用交易担保证券账户内的证券和客户信用交易担保资金，账户内的资金可以动用的情况有（）。
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According to the passage, language learners can reduce the number of their mistakes
A. asking native speakers for explanations B. reading good books in the foreign language C. comparing their speech with that of native speakers D. speaking without regard to native speakers
参与全国银行间债券市场债务回购业务的金融机构应在（）开立债券托管账户。
请选择（59）处最佳答案。
A. form.
B. size
C. region
D. scope
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