BYU, the university run by the Church of Jesus Christ of Latter Day Saints (the Mormons), incudes evolution in it's biology classes. I had a professor last semester who specifically said "evolution is biological change over time. if you look around, it does happen. that doesn't mean we necessarily descended from monkeys, but it's possible, and a lot of people believe we did."
The fact that the school teaches it doesn't mean that the church (or the school) is saying that it's true. What they're saying is "This is a theory that many people believe. You can make your own decision as to whether you believe it or not."
As others have mentioned, the people who think that evolution is impossible within the realm of LDS belief are actually incorrect. The church authorities have not made any authoritative statements on the matter, and it is left up to the individual beliefs of the members. As such, some believe it is true, and some believe it isn't. However, some of the ones who believe it isn't true still agree that it's useful to learn, if for no other reason than to understand what other people believe.
Personally, I've never understood why some religious people think that things like this should not be taught. Regardless of whether I agree with a scientific theory, I think that it's essential for people to learn what the theory is, and why some people believe it to be true. This is particularly essential, imho, in cases where the majority of people believe the theory to be true.