单项选择题

According to the passage, what was used by sleep researchers

A．Music.
B．Ladder.
C．Charts.
D．Signature.
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单项选择题
One reason why children are unable to resist giving personal information on the Internet is that __________.
A．they feel they must follow an adult's orders
B．it is presented in connection with entertainment
C．they do not know that the information is going to be read by someone
D．due to their inability to distinguish an advertisement from a non-advertisement
单项选择题
Many advertisers defend the targeting of children because __________.
A．no actual sales take place
B．it is up to parents to monitor their children
C．children understand what an advertisement is trying to do
D．children are provided a game in return for the information
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