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【简答题】
Many Internet services offer tools for parents to ( ) what their children can see.
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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】A healthy diet is vital to good health.
A.
necessary
B.
difficult to understand
C.
not obvious
【单选题】Researchers often conduct studies to learn more about how things work.
A.
to stop or slow something down
B.
to control
C.
to organize or do a particular activity
【单选题】I'm very good at my job. Consequently, I have been promoted a lot.
A.
in contrast
B.
as a result
C.
without thinking
【单选题】In a way, the human body is a complex machine.
A.
easily understood
B.
very noticeable
C.
having many parts