Children today spend more time stare at computer and (1)______TV screens bo

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问题 Children today spend more time stare at computer and (1)______
TV screens both at school and at home. Scientific (2)______
studies show an epidemic of myopia (also known as
nearsightedness) has struck children—and it is spreading
faster in many countries. Doctors warn that sitting too close
to a computer, especially fixes your eyes at a computer or (3)______
TV screen from close range, increases the risk of myopia.
The cause of myopia is difficult to explain in simple
terms. While some say sitting near computers and TV
screens is one of the reasons, others say children born to
nearsighted parent/parents are vulnerable. (4)______
Can genes or the environment, or a combination of two (5)______
explain the growing prevalence of myopia across many
countries? How can parents understand what causes myopia
and the risks it poses to their children’s eyesight?
Children suffering from myopia have trouble seeing
close objects clearly. The eyeball is thought to become (6) ______
longer, because of which less effort is needed to see up
close. Moreover, the elongated eye can no longer focus on (7)______
distant objects.
Symptoms of myopia are rarely noticed in early (8)______
childhood. Myopic children must hold books very close to (9)______
their face or may not be able to read the writing on the
blackboard in school. They may squint and complain of (10)______
head and eyestrain. [br]

选项

答案 However

解析近视眼患者眼球变长，看近的东西不需要费太大力气；变长的眼球看不清远的物体。这两个部分应该是转折关系，而不是递进关系。故将Moreover改为However，也可以改为Nevertheless。

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