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• (A)and (B) but (C) or (D)so
• (A)animals (B) friends (C)farmers (D)neghbors
• 18．如图所示，四个完全相同的弹簧都处于水平位置，它们的右端受到大小皆为F的拉力作用，而左端的情况各不相同：①中弹簧的左端固定在墙上，②中弹簧的左端受大小也为F的拉力作用，③中弹簧的左端拴一小物块，物
• 19．一定质量的气体经历一缓慢的绝热膨胀过程。设气体分子间的势能可忽略，则在此过程中（ ） (A)外界对气体做功，气体分子的平均动能增加 (B)外界对气体做功，气体分子的平均动能减少 (C)气体对外界
• This machine is very easy . Anybody can learn to use it in a few minutes.(A)operating (B) to be
• (A)it (B) itself (C) him (D)himself
• (A)sound (B) alarm (C) noise (D)voice
• 17．如图，一简谐横波在x轴上传播，轴上a、b两点相距12m。t ＝0时a点为波峰，b点为波谷；t ＝0.5s时，a点为波谷，b点为波峰。则下列判断中正确的是 (A)波一定沿x轴正方向传播 (B)波长

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• — I’m terribly sorry to interrupt, but may I use your phone? It’s rather urgent.— Yes, .(A)with
• . (A)anything (B) nothing (C) something (D)everything
• . (A)walked (B) ran (C)returned (D)withdrew
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• . (A)familiar (B) lovely (C)ordinary (D)outstanding
• . (A)rapidly (B) ruddenly (C)madly (D)urgently
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• . (A)marched (B) flew (C)struggled (D)climbed
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