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【单选题】
That day he had been ____ ever since he got up and by six o'clock in the afternoon he was tired out.A.
on time
B.
on strike
C.
on the air
D.
on the run
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【简答题】A．He's busy with reading. B．He's behind his schedule. C．He is writing a book. D．He is financed by his parents.
【简答题】我国食品安全控制系统存在哪些问题?
【单选题】What can be inferred about Mr. Mendoza?
A.
He is moving to Honolulu.
B.
He is writing a travel book.
C.
He will be visiting his brother-in-law.
D.
He has traveled to Hawaii several times.
【简答题】（5分）浊液中分散质粒子的直径______（填“＞”或“＜”）100nm，溶液中分散质粒子的直径______（填“＞”或“＜”）1 nm，而胶体颗粒的直径介于______之间。这个尺寸与现代材料科学中____ __的直径大致相当，从而使胶体的研究更具有现实意义。布朗运动______（“是”或“不是”）胶体的特有性质。
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