阅读理解。 FISH FOR FUN! DO NOT FISH FOR FOOD! DANGEROUS! FISHERMEN! FOR THE PROTECTION OF YOUR HEALTH! FISH FROM THESE WATERS SHOULD NOT BE EATEN BECAUSE OF MERCURY CONTAMINATION. Department of Land and Forests 1. What's this? It's a ______. [     ] A. letter B. diary C. newspaper D. notice 2. It has been put up ______. [     ] A. to give an order for fish B. for a concert C. to warn fishermen of the danger D. for making fun of fishermen 3. It told the fishermen ______. [     ] A. to stop fishing B. the fish from the waters is unfit to eat C. that they would never go fishing D. that fishing was not allowed here