Scientists have long understood the key role that oceans play in regulating the Earth’s climate．Oceans cover 70 percent of the globe and store a thousand times more heat than the atmosphere does．What’s newer is the understanding of how this key component of our climate system responds to global warming．

       A brake on global warming—for now

       One of the ocean’s most important climate functions is absorbing heat and carbon dioxide （CO2）, one of the gases that cause global warming．Acting as a heat sponge （海绵）, the oceans have absorbed huge amounts of heat and CO2 in the last forty years．

  The most recent scientific report from the Intergovernmental Panel on Climate Change （IPCC） also notes with concern that the ocean is acidifying because of increased absorption of atmospheric CO2, and thus causing a threat for shell-forming species．Sharp increases in carbon dioxide levels will cause further acidification of the ocean．

       Currents distributing heat

       Another important role the oceans play is that of distributor．Oceans deliver heat and life-sustaining nutrients around the globe．Just as blood vessels bring oxygen and nutrients to cells in the human body, the ocean’s currents carry oxygen, nutrients and heat throughout the Earth．The ocean distributes 25 to 50 percent of the energy the planet receives from the sun．For example, the Gulf Stream carries heat across the Atlantic．This warm current gives northwestern Europe a milder climate than it would normally have so far north．A change to the ocean’s circulation （循环） patterns could throw Europe into a colder period, even as the rest of world experiences warmer temperatures．

41．We can infer from the passage that _____．

       A．the oceans cause global warming            B．the oceans stop global warming

       C．the oceans release nutrients and heat        D．the ocean ecosystems face more dangers

42．From the passage we can learn that the ocean’s currents _____．

       A．produce oxygen and nutrients everywhere

       B．absorb 25~50% of the energy from the sun

       C．distribute heat and nutrients around

       D．change the ocean’s circulation patterns

43．Which of the following is NOT the result of the ocean absorbing heat and carbon dioxide?

       A．It causes further acidification．     B．It affects shell-forming species．

       C．It makes the atmosphere hotter．   D．It regulates the Earth’s climate．

44．This passage mainly talks about ______．

       A．the roles of oceans        B．global warming

       C．ocean currents                   D．carbon dioxide

The town I live in is about to put cameras at all traffic lights to catch people who run red lights．It  21  me of how many people I’ve seen who take the yellow light as a  22  to go faster．I also can’t understand why people don’t move when the traffic light has turned green．Above all, there are those   23  situations in which someone doesn’t even 24  that the light turns red, and just keeps going．That is why so many  25 happen! All these situations make me  26   the purpose of traffic lights．

         27 , it’s even more frightening to imagine letting people make their own decisions at   28   crossroads．Do the biggest cars get to go first? Who decides who goes next? So I guess I do like the idea of a system to  29  traffic．And I’ll do my best to   30  the traffic rules: to go, to be cautious, and to stop when I’m  31  to．

       It occurs to me that my   32  have done much the same for me   33   teaching me how to live．They have given me many  34  lights: to get along well with others, to listen and talk to them, to help others, and to   35  with joy and purpose．They have also given me some red lights  36  my life goes astray（误入歧途）: not to be greedy, to keep my temper, and to control my desires．And there  37  have been some yellow caution lights: to watch how much I drink, to keep control of my behavior, and to  38   school regularly and work hard．

       If I obey these rules, my life will be as  39  as it can be．Just as I’m wise to pay attention to the traffic lights when I’m walking across the street, I’m wise to pay attention to the“  40 signals” given to me by my parents．

21．A．suggests       B．informs         C．reminds       D．warns

22．A．sight          B．signal     C．message     D．switch

23．A．instant          B．exciting         C．dangerous    D．cautious

24．A．notice           B．sense         C．remember    D．feel

25．A．events          B．problems       C．situations      D．accidents

26．A．think of        B．wonder about   C．care for        D．worry about    

27．A．Besides         B．Anyway        C．Instead         D．However

28．A．noisy         B．narrow         C．crowded       D．key

29．A．control         B．direct         C．improve        D．serve

30．A．learn          B．obey         C．protect         D．carry

31．A．supposed      B．used          C．devoted        D．delighted

32．A．teachers        B．friends          C．leaders          D．parents

33．A．in charge of     B．in face of               C．in terms of           D．in danger of    

34．A．safe           B．green         C．beneficial      D．helpful

35．A．live            B．share         C．work         D．communicate

36．A．unless           B．when          C．before          D．till

37．A．still            B．even          C．only          D．also

38．A．start          B．attend           C．leave         D．miss

39．A．good         B．colorful         C．meaningful       D．healthy

40．A．traffic           B．light           C．life            D．confidence

 Do you like _______when your son speaks to you without considering enough respect ?

A. that                        B. him                        C. it                    D. those

 It is hoped that an end can _______ to pollution of any kind and we humans can live ______ with nature.

       A．be put; in harmony   B．be adjusted; in terms with

       C．be adopted; in condition   D．resigned; in agreement

 ---You’ve been driving for hours．Shall I ________？

   ---No, that’s OK．I enjoy driving and I know you hate it, especially on the highway．

       A．take back        B．take on            C．take over        D．take up

 ______ nice， the food was all eaten up soon.

A. Tasting                   B. Taste                     C. Tasted         D. To taste

 The bus hit against a tree in the fog and            to the deep valley，with ten passengers killed 

   and twenty wounded.

   A. down did it roll           B. down rolled it            C. it down rolled    D. down it rolled

I haven’t seen Angela for years, and she has changed much, far beyond ____.

A.  seeing             B. recognition            C sight            D beauty

---All the passengers were injured in the accident?

   ---No，           only three children.

  A. it was                   B. it were                            C. there were                D. there was

---Oh, how depressed! I’m bound to lose to him in tomorrow’s competition.

   ---Cheer up! In fact, he is _________ than you.

  A. not more nervous   B. no more nervous  C. no less nervous   D. a little less nervous