题目

阅读理解 Language learning apps are very popular now and offer opportunities to learn vocabulary and practice grammar. But there has been a discussion about just how effective such apps can be. Among the most popular apps are Duolingo and Busuu. Previous research found positive results on the use of them. But these apps mainly concentrated on study with learners who had signed up for language courses and they only worked as afterschool support, so the results were not always reliable. A recent study of 4,095 Busuu users has been carried out aimed to find out if users can actually learn a l如图给出的是计算 的值的一个程序框图，其中判断框内应填入的条件是（ ） A.i≤100B.i＞100C.i＞50D.i≤50