53. What can be inferred about people' S use of salt in the past?
A、People used salt to control blood pressure.
B、People ate much salt in their average diet.
C、People were clear about the harmful effect of salt.
D、People didn't eat so much salt as we do today.
12. There are enough nigh schools in this city. Adults can be educated no matter _____old they are.
A、how
B、what
C、when
D、where
Directions:There are 15 incomplete sentences in this section. For each sentence there are four choices marked A, B, C and D. Choose one answer that best completes the sentenceand blacken the corresponding letter on the Answer Sheet.6–-Did you find the film boring?一-Not at all. It was _____