听力原文：M: Ruth seems very unhappy today.
F: She failed to answer the teacher’s question in class.
Why is Ruth unhappy today？
A. She forgot to do her homework.
B. She didn’t pass a test.
C. She couldn’t answer her teacher’s question.
查看答案
听力原文：The cat is sleeping on the floor.
听力原文：Please look up the word in a dictionary.
听力原文：M: Where do your parents work？
F: They work in a factory.
Where do the woman’s parents work？
A. They work in two different factories.
B. They work in the same factory.
C. Her father works in a factory, her mother works in a school.
大气对流层中臭氧浓度的增加，可吸收地球表面反射回宇宙的红外辐射，使地球气温升高。()
A. 正确
B. 错误
微信支付 
支付宝支付