Multitasking while doing homework is another concern. Some kids listen to music, watch TV or use the phone while doing their homework. "It' s important to make sure that you can stop and concentrate on one thing deeply, " says Rideout.

　　With new and exciting devices hitting stores every year, keeping technology use in check is more important than ever. " Kids should try," adds Rideout. " But parents might have to step in sometimes. "

　　41. Why do children spend more time in using electronic devices?

　　A. Because more electronic devices are available to them.

　　B. Because electronic devices are more exciting than before.

　　C. Because they have less other activities.

　　D. Because they have less homework to do.

　　42. It is known from the passage that

　　____.

　　A. Brandon Blanco feels very annoyed about his late-night text

　　B. the teenagers using mobile devices have increased by 30% in the past five years

　　C. Cheryl Olson is not surprised about kids' increasing use of mobile devices

　　D. most experts think teenagers should not use electronic devices for their studies

　　43. Which of the following is an example of multitasking according to the passage?

　　A. Watching TV while using the computer.

　　B. Talking on the phone while staying with others.

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