— How did you get there?
— I got there________, because it is only 1.5 kilometers.
A:by bike
B:walk
C:by train
D:in a bus
下列能正确反映染色体、DNA和基因三者之间关系的是( )
潮湿的种子堆放在一起会发热,是因为种子的( )
1,2,4,7,11,____,22,29;
1,2,4,8,16,____,64,128;
1,1,1,1,4,7,13,____;
0,1,3,8,21,55,____,____.