This system could be helpful in situations such as （）.
举一反三
- To form a general understanding of a culture from books and films might be helpful, but could also lead to misunderstanding or culture shock.
- Because of the effective and helpful method, I was __________ to answer all the questions I could, and I never worried about making mistakes.
- In the Uniform Cardinal System of Buoyage, a buoy in the eastern quadrant from a danger could ______.
- Should these bombers encounter such an air-defense system, the results could be fatal(致命的).
- Unable to swim, she could do nothing but watch _____ as the boy struggled desperately in the water. A: helpful B: helpfully C: helpless D: helplessly