答案　A

　　A.It is risky but beneficial.

　　B.It is interesting and worth trying.

　　C.It is crazy and cannot become a reality.

　　D.It is impractical though theoretically possible.

　　解析　观点态度题。根据第四段可知利用玉米面在水面上行走听起来不错但在实践时有一定危险一定要做好防护措施因此作者认为这种法在理论上是可能的但不实际故选D。

　　答案　D

　　Passage 3　(2017·新课标全国)

　　话题：面对困惑

　　词数：335

　　(驯兽师) in people's mind is an entertainer holding a whip (鞭)and a chair.The whip gets all of the attentions on all four legs of the chair at the same time.With its focus divided，the lion becomes confused and is unsure about what to do next.When faced with so many options，the lion chooses to freeze and wait instead of attacking the man holding the chair.

　　How often do you find yourself in the same position as the lion？How often do you have something you want to (e.g.lose weight，start a business，travel more)—only to end up confused by all of the options in front of you and never make progress?

　　This upsets me to no end because while all the experts are busy debating about which option is best，the people who want to improve their lives are left confused by all of the conflicting information.The end result is that we feel like we can't focus or that we're focused on the wrong things，and so we take less action，make less progress，and stay the same when we could be improving.

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