人感染血吸虫后，关于是否获得免疫力问题正确的是（） A.可获得完全免疫力 B.可获得
题型：单项选择题 A1/A2型题
问题：
人感染血吸虫后，关于是否获得免疫力问题正确的是（）
A.可获得完全免疫力
B.可获得部分免疫力
C.对再感染无免疫力
D.再感染可获得完全免疫力
E.这种免疫力对体内成虫有杀伤力
题型：单项选择题 A1/A2型题
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，然后从41～60各题所给的四个选项（A、B、C和D）中，选出最佳选项。
Dear Seth,
You’re only three years old, and at this point you are not able to understand this letter today. But someday, when you _36_, I hope you will find something _37_ in what I share with you.
Life can be _38_. There will be people in your life who won't be very nice. They'll 39_ you because you're different, _40_ for no good reason. You will also face heartbreak and might be_41_ by those you love . I hope you don't have to face this too much, but such things_42_ .
Be open to life anyway. You'll find cruelty and _43_ in your journey through life，but don't let that _44_ you from new things. Don't retreat (退却) from life, and don't _45_ or wall yourself off. Be open to new things, new experiences, and new people. You will _46_ many times, but if you allow that to keep you from trying, you will _47_ many chances. Do remember failure is a stepping stone to _48_.
You will meet many people who will try to do _49_ than you, in school, in college, and at work. They’ll try to have nicer cars, bigger houses, nicer clothes, cooler gadgets. To _50_, life is a competition.
Here’s a secret: life isn’t a competition. It’s a _51_. If you always try your best to _52_ others, you’re wasting your life. Learn to enjoy your life _53_ and you will make it a journey of _54_, of learning, of continual improvement, and of love.
Finally, know that I love you and always will. You are _55_ a really wonderful journey, and I will be there for you.
Love,
Your Dad
36. A grow up B show up C cheer up D calm down
37. A familiar B valuable C normal D interesting
38. A unkind B peaceful C equal D simple
39. A end up with B. get on well with C laugh at D look after
40. A if B but C so D or
41. A hurt B found C accepted D impressed
42. A matter B work C disappear D happen
43. A luck B pain C difference D hope
44. A protect B encourage C stop D choose
45. A forgive B struggle C compete D hide
46. A leave B prepare C escape D fall
47. A enjoy B try C miss D meet
48. A success B life C action D sorrow
49. A earlier B better C less D faster
50. A you B me C him D them
516. A challenge B drama C journey D dream
52. A change B pardon C follow D beat
53. A somewhere B instead C afterwards D though
54. A cruelty B danger C happiness D quietness
55. A starting B destroying C recreating D replacing