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【简答题】
填空完成推理过程: [1] 如图,∵AB∥EF(已知) ∴∠A+____=180°( ) ∵DE∥BC(已知) ∴∠DEF=_____( ) ∠ADE=______( )。 [2] 如图,已知AB⊥BC,BC⊥CD,∠1=∠2,试判断BE与CF的关系,并说明你的理由。 解:BE∥CF, 理由:∵AB⊥BC,BC⊥CD,(已知) ∴__________ = ___________=90°( ) ∵,∠1=∠2( ) ∴∠ABC-∠1=∠BCD-∠2 ,即∠EBC=∠BCF ∴________∥________ ( )。 [3]如图,E点为DF上的点,B为AC上的点,∠1=∠2,∠C=∠D。 试说明:AC∥DF。 解:∵ ∠1=∠2(已知) ∠1=∠3( ) ∴∠2=∠3(等量代换) ∴___∥___( ) ∴ ∠C=∠ABD ( ) 又∵ ∠C=∠D(已知) ∴∠D=∠ABD( ) ∴ AC∥DF( )。
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参考答案:
举一反三
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too many
B.
much too
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too much
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many too
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培养爱好
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向上
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向左
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保持字头向上的趋势
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任意
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A.
public
B.
advanced
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embarrassed
D.
honest
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A.
正确
B.
错误
【单选题】He felt much too ______ at being the center of attention.
A.
embarrassed
B.
public
C.
advanced
D.
honest
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A.
many
B.
much
C.
few
D.
little
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氮源
B.
碳 源
C.
无机盐
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生长因子
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