单项选择题 Exercising helps relax your body and has been shown to relieve mental stress as well.(翻译)

单项选择题 Use software that blocks out certain inappropriate websites in case you can't keep an eye anytime.(翻译)

单项选择题 As millions of people have access to the Internet, criminals look for potential victims online.(翻译)由于成千上网的人们具备了上网条件，犯罪分子就会悄悄地物色受害者。C. 由于成百上千万的人们具备了上网条件， 犯罪分子会在线物色潜在的受害者。