庄子如果离开了老子，就没法追溯庄子思想的渊源，老子如果离开了庄子，也就找不到老子思想的发展。（ ）
A. 对
B. 错
News report. Questions 1 to 3 are based on the passages you have just heard.[音频]
A new research on the composition of blood.
B. A new technology for heart attack risk prediction.
C. A new finding of reasons why heart attacks happen.
D. A new research on reducing death rate of heart attacks.
Listen to the recording
A. They can help reduce heart attack rate.
B. They can help analyze images of the fat.
C. They are prone to cause heart attacks.
D. They often surround the blood vessel.
Listen to the recording
A. It is more practical.
B. It is cheaper.
C. It is more sensitive.
D. It is more accurate.
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