According to Dr. Malina, the decrease in physical activity amongst young Americans is mainly due to______.
A. a lack of physical education
B. an unhealthy diet
C. a lack of opportunities for physical exercise
D. the fact there are more opportunities for them not to exercise
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By referring to Dietls book, the author intends to show______.
A. Bo"s intelligence
B. Richard"s charm
C. Mr. Dietl"s fame
D. Mr. Dietl"s authority
According to the Spanish researchers, which of the following statements is true？
A. The closer you are to a mobile phone, the greater your exposure to electromagnetic radiation.
B. The closer you are to a mobile phone that is being used to send and receive signals, the greater your exposure to electromagnetic radiation.
C. The amount of electromagnetic radiation reflected by metal is almost too small to be measured.
D. You shouldn"t stand close to people who are using their mobile phones in train carriages, buses, and lifts.
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