中国人民抗日战争战争胜利纪念日是（）A.8月14日 B.8月15日 C.9月2日 D

现有高秆抗病(DDTT)和矮秆不抗病(ddtt)两种品系的小麦，要利用这两个品系的小麦培育出矮秆抗病且能稳定遗传的优良品种。回答下列问题：

(1)符合要求的能稳定遗传的矮秆抗病小麦的基因型是_____________。

(2)如果利用杂交育种，首先让这两种品系的小麦杂交，所得到的杂交后代F₁基因型是__________。然后让F₁自交，选择所需品种。其中在F₂代中，所需优良品种占F₂总个体数的比例是________________。

(3)如果利用单倍体育种，将上述F₁产生的花粉进行离体培养后得到的单倍体幼苗基因型有____________种。形成单倍体幼苗后为了让其可育还要进行人工诱导染色体数目加倍，其中目前最常用且最有效的方法是用____________处理萌发的种子或幼苗。

—Bob! How’s your project? I heard you started it last Friday，right?

—Oh！I____for it．But I haven’t decided when to do it．

A．have prepared

B．had prepared

C．have been preparing

D．was preparing

（6分）写出下列基团的电子式：

①___________________   ②─C≡C─________________

③ －O－H_____________________________

病历摘要：骨巨细胞瘤患者男，26岁，右尺骨远端隐痛。查体：右尺骨远端压痛，压之略有乒乓球感，皮肤无明显红肿，无明显软组织肿块。行右尺桡骨正侧位片检查。

3.鉴别诊断有哪些？

第二节：完形填空（共20小题；每小题1.5分，满分30分）

阅读下面短文，掌握其大意，从每题所给的A、B、C、D四个选项中，选出最佳选项。

Your friends might be in Australia or maybe just down the road, but they are all just a few clicks away. Life has   36   for millions of teenagers across the world who now make friends online.   37   you use chat rooms, QQ, MSN or ICQ, you are   38   of a virtual community (虚拟社区).

"I rarely talk with my parents or grandparents,   39   I talk a lot with my old friends on QQ," said Fox's Shadow, the online nickname (网名) used by a Senior 2 girl in China. "Eighty per cent of my classmates use QQ   40   school."

QQ is the biggest messaging   41   in China. A record shows 4 million people used it one Saturday night in October,   42   to Tencent, the company which developed QQ.

And Fox's Shadow might well have been one of them. "I log in (登陆) on Friday nights, and Saturdays or Sundays when I feel  43  . I usually   44   about 10 hours chatting online every week," she said. "But I rarely talk with  45  , especially boys or men."

Even though she likes chatting, she is careful about making   46   with strangers online. "You don't know   47   you're talking to. You should  48   be careful about who you trust online."

Many people would like to meet offline when they feel they have got to  49   someone very well. Fox's Shadow once met one of her online friends face to face. It was a girl who was a comic fan like   50   and they went to a comic show together.

However, not all teenagers have been so   51  . At the beginning of this year, a 17-year-old girl in Liaoning Province was killed after meeting a friend she had found on QQ. The criminals (罪犯) weren't   52   until last month.

A 16-year-old Beijing boy, known online as Bart Simon, dislikes QQ users. "I used to chat on QQ, but I found that most people were talking   53  ," he said. Now he chats online in English, using MSN. But he spends little time chatting as he sees it as a  54    of time and money. "If you are really   55   to it, sometimes you just can't concentrate (集中精神) in class," he said.

36.A. improved      B. become      C. changed     D. increased

37.A. Whether       B. If       C. When  D. Unless

38.A. member B. part    C. partner       D. number

39.A. but B. as       C. when  D still.

40.A. before   B. at       C. after   D. since

41.A. service  B. product      C. structure     D. organization

42.A. granting       B. depending  C. considering D. according

43.A. sleepy   B. tired   C. bored  D. busy

44.A. take      B. cost    C. pay     D. spend

45.A. friends  B. adults  C. males  D. strangers

46.A. relation B. touch  C. contact       D. friends

47.A. who      B. which C. whose D. these

48.A. often     B. usually       C. sometimes  D. always

49.A. know    B. recognize   C. tell     D. judge

50.A. herself   B  she    C. anybody else      D. everyone

51.A. good     B. fortunate    C. safely  D. healthy

52.A. kept      B. held    C. caught D. killed

53.A. uselessness    B. noise   C. nonsense    D. rubbish

54.A. short     B. lack    C. waste  D. little

55.A. kept      B. held    C. addicted     D. stuck