But there are people who understand differently. Porf. Ungar of the University of Arkansas agrees the study offers new suggestions of hominid diet, but disagrees about the suggestion that meat could explain the lower carbon-13 levels.

　　One suggestion might be true though---take good care of your teeth. In 3 million years, a scientist might be using them to figure out what you ate for dinner.

　　1. Which of the following can be the best title for the text?

　　A. Protect Your Teeth

　　B. What the Hominid Ate

　　C. Where the Hominid lived

　　D. The Formation of Tooth Enamel

　　2. Before the two scientists' findings, most people thought that hominids__.

　　A. lived half a million years ago

　　B. ate mainly fruits and leaves

　　C. used tools to dig grass

　　D. had sharp teeth

　　3. The two scientists' findings were mainly based on the study about __.

　　A. the shape of hominids' teeth

　　B. the teeth marks of early fruit eaters

　　C. the grasses of 3 million years ago

　　D. the make-up of the tooth enamel

　　4. What is it that Prof. Ungar finds doubtful?

　　A. Hominids possibly ate grass-eating animals.

　　B. Hominids probably had different diets.

　　C. Hominids were basically fruit-and grass-eaters.

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