A、Between the cytotrophoblast and syncytiotrophoblast
B、Within the extraembryonic mesoderm
C、Within the hypoblast
D、Within the epiblast
A、Between the cytotrophoblast and syncytiotrophoblast
B、Within the extraembryonic mesoderm
C、Within the hypoblast
D、Within the epiblast
A、A, B, C.
B、B, C, A.
C、B, A, C.
D、C, A, B.
E、none of the above.
A、The Labour and The Liberal Party
B、The Conservative and The Liberal Party
C、The Labour and Conservative Party
A、Is to validate
B、has to be validated
C、have been validated
D、validate
A、time
B、color
C、nucleus
D、colon
A、热心地
B、拒绝地
C、伤心地
D、努力地
A、Shanhaiguan Pass;Jiayuguan Pass
B、Badaling Section; the west of Gansu Province
C、Jiayuguan Pass;Shanhaiguan Pass
D、Yalu River; the west of Gansu Province
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