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【简答题】
The ability to play is ( ) for human beings. It helps us be happy and innovative.
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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
【单选题】From the damage to the car, it was evident Greg had had an accident.
A.
obvious
B.
not noticeable
C.
made of many parts
【单选题】Some children handle their free time well, whereas others prefer a more structured schedule.
A.
organized
B.
not obvious
C.
necessary
【单选题】Outside noise inhibits me when I'm working. I have to really focus to do a good job.
A.
to control
B.
to stop or slow something down
C.
to do something without thinking