单项选择题

Great as Russell was, many of his ideas ______ today and are being modified by the work of philosophers of our time.

A．are to challenge
B．may be challenged
C．have been challenged
D．are challenging
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One way to conserve water is to ______ dishes, instead of rinsing them, before loading the dishwasher.
A．polish
B．scrub
C．scrape
D．scribe
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______ touched me most was that the poor old lady donated all her savings to support one dropout.
A．That
B．It
C．Which
D．What
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