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【简答题】
在Rt△ABC中，∠BAC=90°，∠B=30°，线段AD是BC边上的中线． 小题1:如图(Ⅰ)，将△ADC沿直线BC平移，使点D与点C重合，得到△FCE，连结AF．求证：四边形ADEF是等腰梯形； 小题2:如图(Ⅱ)，在（1）的条件下，再将△FCE绕点C顺时针旋转，设旋转角为 （0°$amp; <90°）连结AF、DE． AC⊥CF时，转角 的度数；②当 =60°时，请判断四边形ADEF的形状，并给予证明．
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举一反三
【单选题】The CEO's statement in the last sentence of this passage implies that
A.
stress has become the last taboo that people won't dare admit to
B.
succumbing to stress is considered a shameful weakness
C.
corporate elite have no enough courage to admit to stress
D.
being able to handle stress is the most basic of job expectations
【简答题】think ________ 仔细考虑;推敲;琢磨
【单选题】At least how many tests were carried out by the scientists referred to in this passage?
A.
Three.
B.
Two.
C.
Only one.
D.
Four.
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