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问题 选择题
如图所示在三角形△ABC中AB=AC，AD是△ABC的角平分线，DE⊥AB，DF⊥AC，垂足分别为E、F，则下列四个结论中，①AB上有一点与AC上一点到D的距离相等；②AD上任意一点到AB、AC的距离相等；③∠BDE=∠CDF；④BD=CD，AD⊥BC．其中正确的个数是（   ）
A．1个B．2个C．3个D．4个
答案

答案：D

听力题

小题1:All the people b_________into laughter when they heard the funny story.

小题2:We should p_______the wild animals. It is very important.

小题3:I have to get f________with the new classmates in the new school.

小题4:Never play j_______on the disabled people.

小题5:It is a c_______to eat moon cakes on the Mid-Autumn Day.

小题6:It is__________that you are wrong, I am right.（明显的）

小题7:When he saw the snake, he held his_____and dared not say a word.（呼吸）

小题8:There were too many____in the supermarket and I had to go back home.（顾客）

小题9:It is b___________to get up early and do some sports.（有益的）

小题10:I don’t think that we should agree with him. On the_________, I will say "no".（相反）
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选择题

下列物质的沸点由高到低排列的顺序是①  CH3(CH2)2CH3     ② CH3(CH2)3CH3

 ③ (CH3)3CH  ④ (CH3)2CHCH2CH3      ⑤ (CH3CH2)2CHCl

A．⑤②④①③

B．④②⑤①③

C．⑤④②①③

D．②④⑤③①
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