更多"This passage is mainly concerned ab"的相关试题:
[单项选择]What is the passage mainly concerned about
A. Physiological problems of space flight.
B. Speed and gravity of space flight.
C. Gravity and acceleration of space flight.
D. Acceleration and deceleration of space flight.
[单项选择]What is this passage mainly about
A. Call on people to protect sharks.
B. Point out the living environment of sharks.
C. Explain why the sharks are dangerous.
D. An introduction to sharks.
[单项选择]What is the passage mainly about
A. The scientific revolution in the seventeenth century.
B. Reasons that chemistry developed slowly as a science.
C. The practical aspects of chemistry.
D. Difficulties of organizing knowledge systematically.
