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单项选择题

吸气时小腹放松，呼气时小腹收缩。
A、正确
B、错误

问答题

The mounting pile of failure creates a negative feedback loop that threatens Facebook's future in other ways. Indeed, the more Facebook's disappointment in the market is catalogued, the worse Facebook's image becomes. (CET6-2018.6)
A、a shape like a ring
B、a circle
C、a complete circuit for electrical current
D、a set of instructions