下图为中国某河干流区不同土地利用类型的日蒸发量和日蒸发总量（各类用地面积与其日蒸发量的乘积）。读图完成1-2 题。

1．影响该河干流区日蒸发量差异的主要因素是 [     ]

A．土层厚度和植被覆盖率    

B．太阳辐射和土层厚度

C．植被覆盖率和水分条件    

D．水分条件和太阳辐射

2．该河有可能是[     ]

A．塔里木河  

B．松花江    

C．淮河    

D．珠江

The road was so narrow that there would be traffic jams____, especially during the rush hour.

A．every now and then

B．more or less

C．from then on

D．up and down