Writing Practice In this set of materials, the main topic is discussing about the altruism. In the reading parts the author gives two examples, humans and meerkat, and other details to illustrate that altruistic behavior is not benefit individual. However, in the listening part, the professor opposites those ideas in the reading. The first example is humans. In the reading passage the author states that people share their food or donate their organs without return. Nevertheless, in the lecture, the professor indicates that the donor actually gets reputation, appreciation from the society. Another example is the meerkat. In the reading section, first, the author claims that when meerkat as a sentinel they usually guard their burrow without food. Nonetheless, the professor gives newest study information, which shows that meerkat is full of stomach while they acts as a sentinel. Another altruistic behavior of meerkat is sentinel will attract predator’s attention when they alarming others. Contrast to the listening section, the lecture says that sentinel actually close their burrow so that after they creaming alert they can hind in burrow every quickly. Moreover, the crying would cause other meerkat panic so that predator would hunt those panic meerkat instead of sentinel.