Research also suggests that women are _________ on social media than men are in the U.S.
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The most common social media activities are ________ other users' profile pages, reading their news, ...
Every second, _______ new Facebook profiles are created.
现代羽毛球运动最终诞生于
A. 中国
B. 英国
C. 印度
D. 丹麦
发球时,如果球擦网了
A. 和乒乓球一样,必须重新发
B. 如果能落在对方发球有效区内,则是好球
C. 如果没有落在发球有效区内,应重新发球
D. 由裁判根据情况判定