[音频]Questions 19 to 21 are based on the passage you have just heard.What didi Rebicycle do to help Layla Rahimi?
A. It gave her a used bicycle.
B. It paid for her English lessons.
C. It delivered her daily necessities.
D. It provided her with physical therapy.
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[音频]Questions 22 to 25 are based on the passage you have just heard.What do NASA scientists want to learn about?
A. How animals deal with lack of gravity.
B. ow mice interact in a new environment.
C. How low gravity affects the human body.
D. How mice imitate human behavior a space.
What does the passage say about the mice at the beginning of the experiment?
A. They found the space in the cage too small to stay in.
B. They found it difficult to figure out where they were.
C. They were not use to the low-gravity cnvironment.
D. They were not sensitive to the changed environment.
What did the scientists find about the mice from the experiment?
A. They changed their routines in space.
B. They began to eat less after some time.
C. They behaved as if they were on Earth.
D. They repeated their activities every day.
常对数组进行的两种基本操作是( )。
A. 建立和删除
B. 索引和修改
C. 插入和修改
D. 插入和索引
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