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• 17．一列简谐横波沿x轴负方向传播，图1是t=1s时的波形图，图2是波中某振动质元位移随时间变化的振动图线(两图用同同一时间起点)， 则图2可能是图1中哪个质元的振动图线？（）(A).x=0处的质元；
• 【題組】4.(A) For example (B) On average (C) In principle(D) Above all
• 【題組】22. According to Cline, mass-maket labels urge consumers to(A) combat unnecessary waste.(B) shut
• Up until a few decades ago, our visions of the future were largely - though by no means uniformly -
• 【題組】13.(A) assigned (B)rated (C) matched (D) arranged
• 18.图中电阻R1、R2、R3的阻值相等，电池的内阻不计。开关K接通后流过R2的电流是K接通前的 （）(A)．1(B)．2(C)．1(D)．1
• 【題組】5.(A) fond (B)fearful (C) capable (D) thoughtless
• 【題組】23. The word “indictment” (Line 3, Para.2) is closest in meaning to(A) accusation.(B) enthusiasm
• 【題組】32. The IUCN’s “Red List” suggest that human being are(A) a sustained species(B) a threaten to t
• 【題組】14.(A) put (B)got (C)gave (D) took
• 19．下表给出了一些金属材料的逸出功。   现用波长为400nm的单色光照射上述材料，能产生光电效应的材料最多有几种？（）(普朗克常量h=6.6×10-34J·s，光速c=3.00×108m/s)(A
• 【題組】6.(A) in (B) on (C) to (D) for
• 【題組】24. Which of the following can be inferred from the lase paragraph?(A) Vanity has more often bee
• 【題組】33. Which of the following is true according to Paragraph 5?(A) Arc helps limit the scope of fut
• 【題組】15.(A)instead (B)then (C) ever (D) rather
• 20．下列哪个说法是正确的？ （）(A)．体操运动员双手握住单杠吊在空中不动时处于失重状态；(B)．蹦床运动员在空中上升和下落过程中都处于失重状态；(C)．举重运动员在举起杠铃后不动的那段时间内处于超
• 【題組】7.(A) if (B)until (C) though (D) unless
• 【題組】25. What is the subject of the text?(A) Satire on an extravagant lifestyle.(B) Challenge to a hi
• 【題組】34. To ensure the future of mankind, it is crucial to(A) explore our planet’s abundant resources
• 【題組】16.(A)selected (B)passed (C) marked (D) introduced
• 【題組】8.(A) promote (B)emphasize (C) share (D) test
• 21．发出白光的细线光源ab，长度为l0，竖直放置，上端a恰好在水面以下，如图。现考虑线光源ab发出的靠近水面法线(图中的虚线)的细光速经水面折射后所成的像，由于水对光有色散作用，若以l1表示红光成的
• .An old saying has it that half of all advertising budgets are wasted-the trouble is, no one knows w
• 【題組】35. Which of the following would be the best title for the text?(A) Uncertainty about Our Future
• 【題組】17.(A)before (B) after (C) above (D) below