Two students were discussing solubility in science class. One student said that the salt would dissolve faster in warm water. The other student said that the temperature of the water wouldn’t matter. What could the first student do to prove that his hypothesis was correct?

Choose the sentence that is not logically connected in the paragraph. (1) one final effect of radio and tv on the language must must be noted. (2) there is no doubt that these great media of information have cut down considerably the time that used to be devoted to reading. (3) radio and tv may enhance the spoken word. (4) they tend to lower comprehension levels.