3.A　推理判断题。根据第一段中的“but then he actually made good on his word”可知,Belairboy兑现了他8岁时许下的诺言。结合转折连词but可判断,很少有人能兑现自己儿时的重大承诺,故选A项。

　　4.D　推理判断题。根据第二段中的“A Reddit user going by the username Belairboy wrote that...”可知,这是一位昵称为“Belairboy” 的用户在美国社交资讯网站红迪网上写的一个帖子。

　　二、语法填空(共10小题;每小题1.5分,满分15分)

　　Freeflyers:modern skydivers

　　Have you experienced the 1.(thrill) sport—freeflying?Imagine falling towards the planet Earth at an awesome speed of 300 kilometers per hour.You start your fall from over four kilometers above the Earth.And you have less than one minute before you pull your parachute(降落伞)cord.You are falling 2. fast that just turning your head can send you off in a different direction.This is the wild side of a sport that has not found its limit—freeflying. 

　　Freeflying 3.(base) on the more traditional skydiving,4. of which are eye-catching.However,it is more terrifying to watch freeflyers create formations and movements.Freeflyers,5. the name suggests,enjoy the more spontaneous(即兴的)thrill of doing their own things. 

　　The wildest trip for a freeflyer is falling ‘head down’.Falling ‘head first’ requires a great deal of control,which means 6.(travel) not only fast but also 7.(steady).Even the 8.(slight) movement has a great effect on your direction. 

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