用电检查人员实施现场检查时,用电检查员的人数().
A.至少一人
B.不得少于两人
C.不得少于三人
参考答案:B
I told my mother I wasn't worried about my exam. But in fact I ___________. [ ]
A. did
B. was
C. have
D. had
某男孩色盲,他的祖父和父亲均色盲,祖母、母亲和外祖父均色觉正常,则该男孩色盲基因的传递途径是()
A.外祖母→母亲→男孩
B.祖父→父亲→男孩
C.祖母→父亲→男孩
D.外祖父→母亲→男孩