问题
选择题
A、B两种微藻对磷元素需求较高，用相同的培养液分别培养A和B得到两种微藻的生长曲线如图甲所示，图乙表示A、B微藻在不同的磷元素浓度下的生长速率曲线。现将两种等体积的微藻混合培养在磷元素浓度为X的环境中，若只考虑磷浓度的影响，那么随时间的推移预期两种微藻的数量变化曲线可能是
A．
B．
C．
D．
答案
答案：D
搜题请搜索小程序“爱下问搜题”
A、B两种微藻对磷元素需求较高，用相同的培养液分别培养A和B得到两种微藻的生长曲线如图甲所示，图乙表示A、B微藻在不同的磷元素浓度下的生长速率曲线。现将两种等体积的微藻混合培养在磷元素浓度为X的环境中，若只考虑磷浓度的影响，那么随时间的推移预期两种微藻的数量变化曲线可能是
A．
B．
C．
D．
答案：D
| 完形填空。 | ||||
| During the weekend, I usually like to 1 at home, but sometimes I like to go out for a walk 2 play football. My friend Jack works hard 3 the week. At the weekend, he always goes to 4 his uncle and aunt work on their farm with his family.The 5 is not very big, but there is always so much to 6 on a farm. The children look 7 the animals and give them food. Jack and his wife help 8 the fields. At the end of the day, they are all 9 and tired. After Jack's aunt 10 them a big meal, they go back home in a car. | ||||
|