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【单选题】
National defense and clean air are similar in that both are _____, but they differ in that national defense is _____, while clean air is not.A.
rival in consumption; excludable
B.
nonrival in consumption; excludable
C.
excludable; rival in consumption
D.
nonexcludable; nonrival in consumption
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皮皮学刷刷变学霸
举一反三
【简答题】预备 第四册 Unit2 单词&介词.docx 请抄在纸上完成后拍照,上传作业的照片。 要求: 句子要抄下来,空要填,句子要翻译。
【单选题】If the roads __________ not so icy, we could go much faster.
A.
were
B.
are
C.
have been
D.
had been
【单选题】The woman thinks that ______ if the roads were marked.
A.
the man would know how far the bridge is
B.
the man would find his way
C.
it would be easier for her to tell the man the way
D.
she would find the bridge easily
【单选题】If everybody the rules, the roads will be safe.
A.
obey
B.
to obey
C.
obeys
D.
obeying
【简答题】某剂型的特点为:具有保护、润滑、局部治疗作用,也可透过皮肤或黏膜起全身治疗作用。经皮给药系统中药物透过皮肤进入体循环,能避免肝脏的首过效应,避免药物在胃肠道的破坏,减少血药浓度的峰谷变化,降低药物的副作用。14.此剂型的分类不包括A. 软膏剂 B. 膏药 C. 贴膏剂 D. 浸膏剂 E. 凝胶剂
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