B. the teenagers using mobile devices have increased by 30% in the past five years
C. most experts think teenagers should not use electronic devices for their studies
D. Cheryl Olson is not surprised about kids' increasing use of mobile
devices
3. Which of the following is an example of multitasking according to the passage?
A. Playing video games on the Internet.
B. Talking on the phone while staying with others.
C. Watching TV while using the computer.
D. Listening to music while relaxing.
4. The underlined phrase "in check" in the last paragraph can be replaced by "____".
A. in order
B. in control
C. in store
D. in sight
参考答案1—4、BDCB
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