1．Online classrooms are quickly becoming an attractive and popular a________ to traditional classroom settings.
2．An a________ illness is one that becomes very serious and quickly but does not last very long.
3．At that time, backward nationalities were still leading a p________ life in which they ate uncooked animals.
4．You'll get the results when the ________ (分析) is complete.
5．The number of ________ (类别) 4 and 5 hurricanes worldwide has nearly doubled over the past 35 years.
6．The government is taking ________ (试探性的) steps towards dealing with the country's economic problems.
7．Have you ever held a(n) ________ (海贝壳) to your ear and heard the roar of the ocean?
8．Jacob has got ________ (足够的) stage experience, and won't get stage fright.
【答案】1. alternative 2. acute 3. primitive 4. analysis
5．Category 6. tentative 7. seashell 8. ample
