题目内容：

Educational APP Store

Duolingo

Duolingo is regarded as one of the best English language apps today, which is strongly recommended for English amateurs. The system of the app helps you learn English quickly by spending twenty minutes a day. Duolingo structures your lessons that teach you about seven new words based on a topic and skill points being awarded for completing the lessons.

Busuu

Busuu helps you learn English language on the go and the lesson’s quality is guaranteed as it is based on CEFR language framework. Lessons range from beginners to advanced learners. Busuu is actually a great English app if you want to improve your spoken English by talking with native speakers.

Memrise

Memrise uses some creative and easy ways to memorize English words. The focus of this app is to help the users expand their vocabulary by learning English words in an effective way. Memrise also offers an offline mode to continue learning without Internet connection.

Rosetta Stone

Rosetta Stone is designed differently from average language apps on the marketplace today. It’s trying to teach us English the way we’d learn it, as if we were children starting to learn the language. Furthermore, it has exercises designed to help you learn basic words. A variety of lessons are offered that Rosetta Stone has been using for years.

1.Which app mentions the time for daily study?

A. Busuu.

B. Duolingo.

C. Memrise.

D. Rosetta Stone.

2.Why is Memrise distinct from the others?

A. It will give learners quick progress.

B. It has many vocabulary lessons.

C. It is designed for English beginners.

D. It can be applied offline as well.

3.The passage is written to ________.

A. inform readers of research results

B. encourage English beginners

C. recommend English-learning apps

D. introduce ways of learning