A:join in
B:laugh at
C:run away from
回答下列有关核酸的问题:
(1)DNA大多是由____条____ 链构成,RNA通常是由____条____链构成的.
(2)若图为DNA的局部,则从碱基组成上看,还应有的碱基是____ ;图中①是____,②是____ ,③是____ ,④是____
(3)若图为RNA的局部,则从碱基组成上看,还应有的碱基是____ ,图中②是____ ,④是____ .
— Have you seen _____TV programme Running Man?
— Of course. It's really ____funny one.
下列各图不是正方体表面展开图的是( )