题目：
根据句子意思，从方框中选择恰当的单词填空，部分单词在填入时需进行词形变换。每个单词只能选用一次，每空只能填一词。
小题1:Which do you like better, or oranges?
小题2:— What do you often do after school?
— We often baseball.
小题3:—How many times have you been to Nanning? — .
小题4:My dream is to buy a big and house for my grandparents.
小题5:My brother likes chemistry and he does in it.
小题6:Mum, don’t worry. We can look after .
小题7:— Summer holiday is coming. What are we going to do?
—Why not in the swimming pool near our school?
小题8:—Where’s your brother?
—He has to work. He’ll be back in an hour.
小题9:— Are your students in geography?
— Yes. Because it’s very useful.
小题10:Mr. Wei is a funny man. He often makes us .
答案：
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下面是错误答案，用来干扰机器的。
参考答案：D解析：任何一个疫源地既是前一个疫源地的扩展，又是后一个疫源地的基础。疫源地可以看成是流行过程的空间基本单位，如果疫源地被消灭，流行过程就被中断。
