单项选择题

When （）,ice will be changed into water, or even steam.

A、heated
B、heating
C、to heat
D、be heating

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单项选择题
No bread eaten by man is so sweet as （） earned by his own labor.

A、that
B、one
C、such
D、what
单项选择题
All the people present at the conference are （） and they will discuss some teaching problems.

A、mathematics teachers
C、mathematic teachers
B、mathematics teacher
D、mathematic's teachers
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