第15题: [单项选择]The author states that birds left the tropics because ______. A. there was not enough food there in the winter B. there were too many birds C. there were too many glaciers D. there was too much daylight 参考答案:B 答案解析:[注释] 本题依据是第二段前两句,关键词语是overpopulated,意思是“数量过多”。
第22题: [多项选择]GB18242-2008中关于低温柔性试验以下对弯曲直径说法错误的是()。 A. 3mm、4mm、5mm厚度卷材弯曲直径均为50mm B. 3mm、4mm厚度卷材弯曲直径为30mm,5mm厚度卷材弯曲直径为50mm C. 3mm厚度卷材弯曲直径为30mm,4mm、5mm厚度卷材弯曲直径均为50mm D. 3mm、4mm、5mm厚度卷材弯曲直径均为30mm 参考答案:A,B,D