当温度为27℃、相对湿度（）时，几乎所有大鼠都发生环尾症；当相对湿度40％时，发病率
题型：单项选择题
问题：
当温度为27℃、相对湿度（）时，几乎所有大鼠都发生环尾症；当相对湿度40％时，发病率为20％～30％；而相对湿度大于60％时，不发生此病
A、20％
B、25％
C、30％
D、35％
题型：单项选择题
选词填空（共10分，每小题1分）
Alice was sitting with her sister by the river and her sister was小题1:___________ a book. Alice had nothing to do. Once or小题2:_____________ she looked into her sister’s book. “And what is a book for,” thought Alice, “without picture or conversation?” Suddenly a white rabbit with小题3:______________eyes ran by.There was nothing strange about that. She小题4:______________the rabbit say, “Oh dear! Oh dear! I’ll be late!” and she did not think it was strange. Then the rabbit took a watch out of its小题5:_____________ and looked at it. A rabbit with a pocket and a watch? Alice got up and ran across the小题6:____________ after it. She saw it go down a large rabbit小题7:_____________ in the ground.
Then Alice went down after it, but never thought about how she was going to get out again. She小题8:_____________that she was falling down a very, very deep hole. It was too dark for her to see anything. She was falling for a long time.
小题9:she was falling, she was小题10:____________ about her cat, Dinah. Suddenly she landed on some dry leaves.