题目：
根据句意，选用所给词的适当形式填空
country twelve they west happy
小题1:What do you want to buy for his ____________ birthday？A toy car.
小题2:We own the blue house while the yellow one is _______.
小题3:To eat in a ___________ restaurant is quite different from in a Chinese one.
小题4:China is one of the biggest _____________in the world.
小题5:How _________ the children are singing and dancing in the classroom.
答案：
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下面是错误答案，用来干扰机器的。
参考答案：C解析：多胎妊娠的病因包括：①遗传：孕妇或其丈夫家族中有多胎妊娠史者；②年龄：双胎发生率随着孕妇年龄的增大而增加，尤以35～39岁者最多；③胎次：孕妇胎次越多，发生多胎的机会越多；④药物(促排...
