下列哪些是CK的变异体()
A.CK-MM
B.CK-MB
C.巨CK1
D.巨CK2
E.CK-BB
参考答案:C, D
尿液中含有血液,称为()。
Bears often hide themselves in places can’t be found by hunters.
A.in which
B.where
C.that
D.不填