如图，AB是⊙O的直径，C、D是⊙O上的两点，若∠BAC=20°，=，则∠DAC的度数是(   )

从所给的四个选项中选出最佳答案，将其序号填入题前括号内。

    A young man 1 himself in Japan with only enough money to buy the ticket for his  2 back home. As he knew that it would take him only two days to 3 home, he decided that he could easily spend the time 4 food. So he bought a ticket and 5 the ship. The man 6 his ears to the sound of the lunch bell. When dinner 7 came, he didn't go to the dining room, 8 that he was not feeling well. The next morning he still didn't have breakfast and at lunch time he again 9 in his room. But at dinner time he was so hungry that he went to the dining room and 10 everything the waiter put in front of him. “Bring me the bill,” he said. “The bill, sir?” said the waiter in surprise. “There isn't any bill. On our ship meals are included in the money for the ticket.”

下图为东亚某地水循环示意图，图中序号表示水循环环节。读图回答下列各题。

  80毫米和8分米一样长．____（判断对错）