甲、乙两名射击运动员参加预选赛,他们每人10次射击成绩的平均数都是9环,方差分别是s2甲=1.2,s2乙=2.4,如果从这两名运动员中选取成绩稳定的一人参赛,那

甲、乙两名射击运动员参加预选赛,他们每人10次射击成绩的平均数都是9环,方差分别是s2甲=1.2,s2乙=2.4,如果从这两名运动员中选取成绩稳定的一人参赛,那么应选____(填“甲”或“乙”).

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—All of our classmates ______ Jack are going to the welcome party for foreign st

—All of our classmates ______ Jack are going to the welcome party for foreign students on Saturday.—

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In America, Father’s Day is ________ the third Sunday of June.

In America, Father’s Day is ________ the third Sunday of June.

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—Peter, what are you doing?—Oh,I_________ a report about national heroes.

—Peter, what are you doing?—Oh,I_________ a report about national heroes.

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do (单数第三人称形式)

do (单数第三人称形式)

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