如图为某植物光合作用过程示意图.请据图回答:
(1)在类囊体上分布有吸收光能的____ .
(2)图中①为____ ,(CH2O)中的能量直接于____
(3)若突然停止CO2供应,则短时间内C3的含量将____ (填增加、减少或不变).
(4)农业生产上提高产量的措施有:控制光照强弱和温度的高低,适当增加环境中____ 的浓度.
注意:1)词数100左右;
2)可以适当增加细节,以使行文连贯;
3)开头和结尾已给出,但不计人总词数。
Dear Charlie,
How time flies! It has been almost a year since your last visit.
-What colour are they?-They're ____.
Mr. Jackson is a teacher of science in a middle school. His students like his classes because his classes are very interesting. They can learn a lot in his class. The students can make(制作)many things. His little son Val also likes making things. He makes lots of machines(机器), such as a machine like a man. It can do the job that is dangerous(危险的)for people to do. He says, “I want to be a scientist.”根据短文内容,选择正确答案。
关于地球形状的说法, 正确的是 ( )