四年来，社会保障与就业类支出占各级公共财政总支出比重保持在（）以上。
A.15%
B.5%
C.10%
D.20%
参考答案：C
用于诊断时，骨髓抽取量应小于()
A．0.1ml
B．0.3ml
C．1.0ml
D．2.Oml
E．2.5ml
The association is（）to raising funds to help the blind.
A.conducted
B.committed
C.concentrated
D.concerned
