正确答案: D

题目：下列函数中，在x=0处不可导的是（　　）

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学习资料的答案和解析：

[单选题]改革开放以来，对市场经济认识的重大突破是

市场经济不属于社会基本制度的范畴

解析：对市场经济认识的重大突破是：党的 十四大提出，我国经济体制的改革目标是建立社 会主义市场经济体制，从根本上破除了把计划经 济与市场经济看做是属于社会基本制度范畴的思 想束缚。故选“D”。

[单选题]新中国成立初期，国内的主要矛盾是

封建主义和民主主义之间的矛盾

[单选题]He is always complaining about one thing or________

another

解析：考查常用短语。0ne thing or another一件事，另一件事。这个不是固定词组，但常被连起来使用。选项A是正确的。【句子大意】他总是在抱怨，不是这件事就是那件事。

[单选题]__________

根据以下内容，回答下面的题目。Investors can _51_ money simply by loaning it．The money they loan is called capital．Security (担保) is an expensive item which the borrower mortgages (抵押) to the investor to show that he intends to _52_ the debt．The way investors make money on loans is to charge interest．Interest is money that _53_ pay to investors for the use of their money．Interest is usually a certain percentage of the capital．Investors sometimes _54 ten percent or more interest per year．The interest may be calculated daily, monthly, or yearly．The interest must be _55_ before the capital can be repaid．If the interest is not _56_ the agreed rate, the interest is added _57_ the capital．Then the borrower has _58_ pay interest on the unpaid interest _59_ on the capital．A debt can grow quickly this way．If the total of the capital and accumulated interest gets too high, the investor will take _60_ of the item used as security and sell it to get his money back．__________

charge

[单选题]Sequoyah was a young Cherokee Indian．son of a white trader and an Indian Squaw(北美印第安女人)．At an early age，he became fascinated by“tile talking leaf”，an expression thathe used to describe the white man’s written records．Although many believe this"talking leaf”to be a gift from tile Great Spirit，Sequoyah refused to accept that theory．Like other Indians oftile period，he was illiterate，but his determination to remedy tile situation led to the inventionof a unique 86 character alphabet based on the sound patterns that he heard． 　　His family and friends thought him mad，but while recuperating(恢复)from a huntingaccident．he diligently and independently set out to create a form of communication for his ownpeople as well as for other Indians．In l821，after twelve years of work，he had successfully de。veloped a written language that would enable thousands of Indians to read and write． 　　Sequoyah’s desire to preserve words and events for later generation has caused him to be remembered among the important inventors．The giant redwood trees of-California，called“se-quoias(红杉)”in his honor，will further imprint his name in history． 根据以上内容，回答{TSE}题。{TS}What is the most important reason that Sequoyah wiU be remeIll]bered?

He created a unique alphabet．

[单选题]

[多选题]等容收缩期的特点是（　　）

心室容积不发生改变

房室瓣和半月瓣都关闭

[多选题]吸气末肺内压 （　　）

等于大气压

等于呼吸末肺内压

[单选题]关于纵隔 （　　）

食管位于后纵隔