蕲蛇头部毒腺:()
A.血性毒,神经毒
B.溶血成分
C.凝血酶样物质
D.鸟嘌呤核苷
E.微量元素
参考答案:A, B, C, D, E
The affective filter hypothesis of Krashen's Monitor Model states that acquires with______affective filter seek and receive more comprehensible input.
A.low
B.average
C.high
D.very high
建国以来,我国农村生产关系的变革和调整经历了四个步骤,依次是
①土地改革 ②人民公社化 ③农业合作化 ④家庭联产承包责任制
A.①②③④
B.①③②④
C.①④②③
D.③①④②