activity前面是a还是an

activity前面用an

Does such an activity constitute a criminal offence?

难道这样的活动也算刑事犯罪吗

Completing an activity or journey完成一项活动或走完一段路程。

The office bustled with people and activity .办公室里人来人往，忙忙碌碌。

These activities occupied most of her time .这些活动占去了她的大部分时间。

The house was quiet， with no-sounds of activity .整幢房子悄然无声，死气沉沉。

Two couples undertake a leisure activitytogether .两对男女一同参加娱乐活动。

I admire the activity of your benevolence .你完全是出于一片手足之情，我很佩服。