隔热服的反射率以硫酸钡作为标准样品对比，其全反射为（）%。
A.60
B.70
C.80
D.90
参考答案：C
Children give gifts their teachers.[ ]
A. to
B. on
C. for
D. with
He has been fired and will have to _______ charge of his office tomorrow.
A．take over
B．hand over
C．get over
D．go over
