下列说法正确的是 A．因海水中含有镁元素，故不需经过化学变化就可以得到金属镁 B

已知，OA⊥OC，且∠AOB：∠AOC=2：3，则∠BOC的度数为[ ]

A．30°

B．150°

C．30°或150°

D．90°

完形填空（共20小题；每小题1.5分，满分30分）

阅读下面短文，从短文后各题所给的四个选项（A、B、C和D）中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。

My workplace, as do many others in our town, supports local services and the needy. One of the main services we _____21________ is our local food bank, a center where free food is made available to those in need.

This year, the food bank is _____22_______ more than in the past. _______23 cannot let the shelves become depleted(被耗尽的) or the food _______24________. Others, ________25______ children, depend on it. With the country’s _______26_______ situtation stalled(停滞) and more people out of work, more people are _____27______ and need supplements to feed their families.

This year, all the _______28______ in our area got together and decided to sponsor a “Food Fight Contest”. The contest will include 3 categories or areas to ______29_____: a) supply the most food, b) donate the most money, _______30______ c) provide the most volunteers. A company can win in all 3 areas or 3 different companies can win in each different area, ______31_____ the results. The contest will begin April Fool’s Day through the end of the month.

We’re kicking off a(n) _______32________ for fun this week. We’re all _______33______ and WE PLAN TO WIN! The last several years, to make donating ________34______, we set up food sculpture competitions between departments. Each department _______35______ bring in cans, sacks of rice, peanut butter, etc., then build and compete for the best _____36_____. The sculptures would be in a central location so coworkers could cast their vote for their ______37______. We tracked how much ____38_____ was provided by each group and then after the competition, all the _______39______ were taken to the food bank. We challenged ourselves to deliver more food and more weight each year, _______40______ it was for a great cause.

21. A. turn to          B. belong to          C. refer to          D. donate to

22. A. supported        B. challenged        C. criticized        D. enlarged

23. A. We             B. You               C. They           D. All

24. A. pile up          B. go bad             C. run out          D. sell well

25. A. only            B. actually         C. even             D. especially

26. A. cultural          B. economic         C. historical         D. political

27. A. hungry           B. anxious           C. unhappy         D. lazy

28. A. schools         B. charities       C. companies        D. governments

29. A. prove            B. stress             C. find              D. win

30. A. or               B. and             C. but               D. so

31. A. focusing on        B. relating to      C. depending on     D. leading to

32. A. campaign         B. adventure      C. ceremony         D. exhibition

33. A. excited           B. involved         C. thanked         D. prepared

34. A. likely            B. fun               C. useful           D. public

35. A. could             B. must             C. would           D. should

36. A. design            B. grade             C. speech          D. play

37. A. group           B. friend            C. hobby           D. favorite

38. A. money           B. food             C. energy          D. attenetion

39. A. gifts             B. goods          C. donations        D. participants

40. A. knowing          B. imagining        C. hoping          D. showing

三种后续文明中最落后的文明是（）

A、西欧文明

B、伊斯兰文明

C、拜占庭文明

D、东欧文明

水情信息编码校核时，对拟报的原始水情信息检查核对后，要按水情信息编码标准检查编码的基本格式、基本规则、具体项目（）是否正确。

A、记录格式

B、编码格式

C、记录资料

D、编码资料

某患者面部外伤造成右侧上唇部分缺损，缺损大小相当于上唇的1/5。伤口不甚干净，创面已不渗血。必要的处理措施为（）

A.清创

B.直接拉拢缝合

C.采用下唇组织瓣转移修复上唇缺损

D.注射破伤风抗毒素（TT）

E.应用抗生素