A:
B:
C:
D:
3.5×0.99____3.5
23.2×0.9____0.9
2.76×1.52____1.52
4.25×1.1____4.25
1×0.44____0.44
7.1×0.54____7.1×5.4
生物进化的总体趋势是由____,由____,由____.