It is one of Duolingo's weakness, using words in context is the fastest way to learn since you can grasp the general meaning before every element. For that, there needs to be more typing exercises and less multiple choice words.
This type of lessons do not help me at all. I know for some the absurdity help them to remember the phrases, but it does the opposite for me - since it is useless. I wish more useful sentences were presented, even if it meant longer study sessions.