单项选择题

Vitamins are complex ______ that the body requires in very small amounts.

A．matters
B．materials
C．particles
D．substances
<上一题 目录 下一题>
热门 试题

单项选择题
His wife is constantly finding ______ with him, which makes him very angry.
A．errors
B．shortcomings
C．fault
D．flaw
单项选择题
Though ______ in a big city, Peter always prefers to paint the primitive scenes of country life
A．grown
B．raised
C．tended
D．cultivated
相关试题