问题
单项选择题 A1/A2型题
对于人工主动免疫，免疫力通常出现于接种后的（）
A.1～4小时
B.1～4天
C.1～4周
D.3个月
E.6个月
答案
参考答案：C
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对于人工主动免疫，免疫力通常出现于接种后的（）
A.1～4小时
B.1～4天
C.1～4周
D.3个月
E.6个月
参考答案：C
Some years ago I was offered a writing assignment that would require three months of travel through Europe. I had been __36__ a couple of times, but I could hardly __37__ to know my ways around the continent. __38__, my knowledge of foreign languages was __39__ to a little college French. I __40__. How would I, unable to speak the language, __41__ familiar with local geography or transportation systems, conduct interviews and do __42__? It seemed impossible, and with considerable __43__ I sat down to write a letter rejecting the __44__. Halfway through, a __45__ ran through my mind: you can’t learn if you don’t try. So I __46__ the assignment. There were some bad __47__. But by the time I had finished the trip, I was an experienced traveler. And ever since, I have never hesitated to head for even the most __48__ places, without guides or __49__ advanced bookings, confident that somehow I will __50__. The point is that the new, the different, is almost by definition __51__. But each time you try something, you learn, and as the learning _52_, the world opens to you. I’ve learned to ski at 40, and flown up the Rhine River in a (n) __53__. And I know I’ll go on doing such things. It’s not because I’m braver or more daring than others. I’m not. But I’ll accept worry as another name for _54_and I believe I can 55_ wonders.
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