材料孔隙越大,容重越小,其密度比重也越小。( )
A. 对
B. 错
Questions 17 to 20 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions. Now listen to the passage. What is the focus of people’s attentions today according to the passage
A. designing better cars.
Building more highways.
C. Increasing people’ s awareness of traffic problems.
D. Enhancing drivers’ sense of responsibility.
Questions 8 to 10 are based on the following conversation. At the end of the conversation, you will be given 15 seconds to answer the questions. Now listen to the conversation. In order to persuade the professor to help her, the woman says that ______
A. she is unusually well prepared
B. she wants to take an easy course
C. she needs additional credits in the subject
D. she wants to read a book in this field
Questions 29 and 30 are based on the following news. At the end of the news item, you will be given 10 seconds to answer the questions. Now listen to the news. Sabrina Harman was sentenced to a six-month imprisonment for ______
A. [A] failing her duties and her missions
B. killing detainees at a Baghdad prison
C. taking pictures of prisoner abuse [D) prisoner abuse at Abu Ghraib