Multiple-Choice tasks are too easy
Most of the Multiple-Choice taks ("Mark all correct translations") are of the form:
1) a x 2) a b 3) y b
Notice: Answer 2) is correct, because it contains a and b.
An example would be:
1) L' baguette est chaude. 2) La baguette est chaude. 3) La baguette est chaud.
"L'" appears once, "La" twice, thus "La" is the right article. "chaud" appears once, "chaude" twice, thus "chaude" is the right adjective. The only option consisting of both "La" and "chaude" is option 2), thus 2) is the correct translation.
Please make the Multiple-Choice tasks harder.
I agree that some are very easy, but: Duo keeps pretty close track of how we do on all sorts of questions, and have a good understanding of how difficult things can be before they start losing users. Many folks need a few 'easy ones' so they can get through a lesson without losing all their hearts -- and working the logic you use as an example is not an easy task for many learners.
These are actually tricky when two of the three options are correct. It's made me spend time thinking about each option before dismissing it. Also, one could argue that the "hover" feature makes it too easy, but we are our own stewards here.
I think on of the reasons to have these "too easy" tasks is to introduce a word or another meaning for it in a "foolproof" way. Sometimes Duolingo get criticized for "testing" without "teaching". I see these simple questions as one way of teaching, which fits in the Duolingo task format.