4. What advice is given for printing the signs according to the last paragraph? A. Colored signs are preferred. B. Bold letters should be used. C. Large pictures should be included. D. Phone numbers should be provided.

4. What advice is given for printing the signs according to the last paragraph?

A. Colored signs are preferred.

B. Bold letters should be used.

C. Large pictures should be included.

D. Phone numbers should be provided.

出自：河南农业大学-大学英语

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