单项选择题

For a long time, most doctors maintained that taking massive doses of vitamins was relatively harmless; now, however, some are warming that excessive dosages can be ______.

A. healthy
B. expensive
C. wasteful
D. toxic
E. inane
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多项选择题
Created to serve as perfectly as possible their workaday ______, the wooden storage boxes made in America’s Shaker communities are now ______ for their beauty.
A. environment
B. owners
C. function
D. employed
E. valued
F. transformed
单项选择题
At first, I found her gravity rather intimidating; but, as I saw more of her, I found that ______ was very near the surface.
A. seriousness
B. confidence
C. laughter
D. poise
E. determination
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