问题
选择题
在右上图中的食物网中，丙与戊的关系是
A．竞争
B．捕食
C．竞争、捕食
D．合作
答案
答案：C
戊以丙为食物，说明两者是捕食关系，戊和丙又都以乙为食物，说明二者又存在着竞争关系。
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在右上图中的食物网中，丙与戊的关系是
A．竞争
B．捕食
C．竞争、捕食
D．合作
答案：C
戊以丙为食物，说明两者是捕食关系，戊和丙又都以乙为食物，说明二者又存在着竞争关系。
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| Two friends went to a city and 1 in a big hotel. Their room was on the 56th floor, and there was a fast lift, so they went up and down very 2 . They came back to the hotel very late one Saturday 3 ,and the liftman said to them," The electricity (电) stopped today. You can't 4 the lift now, " The two friends said. "We 5 to go upstairs (上楼) to our room." They left their coats downstairs because they were 6 , and began to climb. It took a 7 time, but they sang some interesting songs. At 12:00, they 8 the 56th floor. Then one of them put his hand in his pocket (口袋) and stopped. He said to 9 , "Now. I'm going to sing the most interesting song of all. Its name is: I 10 the key to the room downstairs in my coat." | ||||
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