下列不是结肠癌转移途径的是()。
A.淋巴结转移
B.胃转移
C.门静脉栓塞
D.直接蔓延
E.血行播散
参考答案:B
—Are you pleased with what he has done?
—It couldn’t be ________ . Why didn’t he put more effort into his work?
A.any worse
B.much better
C.so bad
D.the best
在一定条件下各种形式的能都可以相互转化:
示例:摩擦生热:机械能转化为内能.
请你仿照示例分别写两个:①______;
②______.