D. Why to keep babies' teeth clean

　　70. The passage indicates that

　　_______

　　•

　　A. Enamel is most widely used to protect teeth in the world

　　B. Bad teeth may affect the health of adults and the young

　　C. Breast milk can cure babies' bad teeth

　　D. Babies' teeth should be brushed once per day

　　71. The writer uses the boy's death as an example to show that

　　_______•

　　A. not only adults but the young may suffer from teeth problem

　　B. babies with bad teeth can easily die

　　C. the doctors should be responsible for the case

　　D. the boy was not fed with his breast milk

　　E

　　For my grandmother's 70th birthday, my family and I visited South Korea. While there, I was attentive to Korean high schools and students.

　　I was surprised by how different Korea's public high schools are from America's. Korean high

　　schools can be all-girls, all-boys or co-ed (男女同校的）unlike our standard co-ed high schools. There are three grades: “go 1”（10th)， "go 2” (1 lth) and ‘‘go 3” (12th). ‘‘Go，，is the first syllable of the word “go-deung -hakkyo", which, simply translated, is “high school”.

　　In America, unless you want to go to a private school, you don't have to take an entrance exam. In Korea, however, students must take a test to get in because of the many choices of schools.

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