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【单选题】
缓、控释制剂主要有骨架型和贮库型两种。药物以分子或、微粒的形式均匀分散在各种载体材料中，则形成骨架型缓、控释制剂；药物被包裹在高分子聚合物膜内，则形成贮库型缓、控释制剂。两种类型的缓、控释制剂所涉及的释药原理主要有溶出、扩散、溶蚀、渗透压或离子交换作用。关于缓、控释制剂的特点，叙述错误的是（）A.
减少给药次数
B.
避免峰谷现象
C.
降低药物的不良反应
D.
适用于药物消除半衰期很长的药物（t1/2＞24小时）
E.
减少用药总剂量
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【单选题】I ______ writing the paper as scheduled, but my mothers illness interfered. I hope you will excuse me.
A.
am to have finished
B.
was to have finished
C.
was to finish
D.
ought to finish
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【单选题】What is one of the ways that American people honor their mothers on Mother's Day?
A.
They present their mothers with carnations.
B.
They send money to their mothers.
C.
They wear a carnation.
D.
They write a thank-you letter to their mothers.
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