[多选题]某交易者以9710元／吨买入7月棕榈油期货合约100手，同时以9780元／吨卖出9月棕榈油期货合约100手，当两合约价格为（ ）时，将所持合约同时平仓，该交易者盈利。（不计手续费等费用）
A.7月份合约为9730，9月份合约为9750
B.7月份合约为9720，9月份合约为9770
C.7月份合约为9750，9月份合约为9740
D.7月份合约为9700，9月份合约为9785

All great writers express their ideas in an individual way: it is often possible to determine the authorship of a literary passage from the style in which it is written; 46)Many authors feel that the conventions of the written language hamper them and they use words freely, with little observance of accepted grammar and sentence structure, in order to convey vividly their feelings, beliefs and fantasies. Others with a deep respect for traditional usage achieve a style of classical clearness and perfection or achieve effects of visual or musical beauty by their mastery of existing forms enriched by a sensitive and adventurous vocabulary, vivid imagery and a blending of evocative vowels and consonants.
Young people often feel the need to experiment and, as a result, to break away from the traditions they have been taught. In dealing with a foreign language, however, they have to bear in mind two conditions for experiment. 47)Any great experimental artist is full