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【单选题】
Whose crayons__those? They are Peter's.A.
is
B.
are
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皮皮学刷刷变学霸
举一反三
【单选题】常温下向四份0.1 mol·L －1 的醋酸钠溶液中分别加入少量冰醋酸、硫酸氢钠固体、醋酸钠固体、氢氧化钠固体（忽略溶液体积及温度变化），则溶液中c(Ac － )/c(Na ＋ )变化正确的是
A.
增大、增大、不变、减小
B.
增大、减小、增大、减小
C.
减小、增大、增大、减小
D.
增大、减小、不变、减小
【单选题】The modern age is a permissive one in which things can be said explicitly, but the old traditon of ______ dies hard.
A.
talkativeness
B.
exaggeration
C.
condemnation
D.
euphemism
【单选题】________important computers are to everybody in a modern city!
A.
What
B.
How
C.
What an
D.
How an
【简答题】试述烘箱法测定棉花回潮率时，箱内热称法结果较箱外热称法低的原因。
【单选题】We will have modern equipment ______ things that are complicated. This will make things simple.
A.
to assist us with
B.
assist us to
C.
to assist us in
D.
assisting us with .
【简答题】What modern things does Buck find himself in need of in his life on the island?
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