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

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单项选择题
All the people present at the conference are （） and they will discuss some teaching problems.

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