When spring comes and the flowers begin to bloom(开花), the bees come out of the hives(蜂房) very early in the morning. 小题1:

The bee has a long tongue which goes into the flower to suck(吸) up the juice.

小题2:           When the bee flies out to work in the morning to look for flowers, it may go to places very far from its hive, but it never loses its way. When the rain comes down, the bee will hide in some little hole in a wall, or perhaps among the leaves of a tree, or inside a large flower.

小题3:

Bees gather not only the juice but also the pollen(花粉) from inside the flowers.

小题4:                      They also use pollen to make wax(蜂蜡).

小题5:                   We may also thank it for many useful things which are made of wax.

下列几种不同碱基组成比例的DNA分子，哪一种DNA分子的Tm值最高（）。

A.A+T=15%

B.G+C=15%

C.G+C=40%

D.A+T=80%

E.G+C=35%