Knowing what colors look good _______ your skin is of great importance when you buy clothes.

A．beyond

B．within

C．against

D．Over

急性毒性中，按大鼠口服LD₅₀实际无毒级为

A．(1～50)mg/kg
B．(50l～5000)mg/kg
C．(5001～15000)mg/kg
D．(10001～15 000)mg/kg
E．＞15000mg/kg