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【单选题】Biological ClockWhen the sun rises on a warm and sunny day, you can see some flowers open up. When they close late in the afternoon, other flowers open.Biological rhythms（生物节律）, like the opening and c...
A.
But where can you find it?
B.
This makes them feel tired.
C.
In the summer they fly back to have babies.
D.
We are learning more and more about them.
E.
Biological clocks can be adjusted.
F.
Other rhythms are based on months, seasons or years.
【单选题】下列是一组有规律的图案，第1个图案由4个基础图形组成，第2个图案由7个基础图形组成，第3个图形由10个基础图形组成，第5个图形中基础图形的个数为（ ）
A.
13
B.
14
C.
15
D.
16