正确答案: D

to havegraduated

题目：He seems_______ from this university．

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学习资料的答案和解析：

[单选题]设a={-1，1，2)，b={3，0，4}，则向量a在向量b上的投影为

[单选题]The author tends to think that the fifth level________

回答下面的题目Human needs seem endless．They might be regarded as making up several levels．When there is　enough money to satisfy one level of needs, another level appears．The first and most basic level of needs involves food．Once this level is satisfied, the second level　of needs, clothing and some sort of shelter, appears．By the end of World War Ⅱ , these needs were satisfied for a great majority of Americans．Then a third level appeared．It included such items as automobiles and new houses．By 1957 or 1958 this third level of needs was fairly well satisfied．Then, in the late 1950s, a　fourth level of needs appeared: the "life-enriching level．While the other levels involve physical satisfaction, that is, the feeding, comfort, safety, and transportation, this level stresses mental needs for recognition, achievement, and happiness．It includes a variety of goods and services．Among them are vacation trips, the best medical and dental care, and recreation．Also included here are fancy goods and the latest styles in clothing．On the fourth level, a lot of money is spent on services, while on the first three levels more isspent on goods．A fifth level would probably involve needs that can be achieved best by community action．Consumers may be spending more on taxes to pay for government action against disease, ignorance, crime, and prejudice．After filling our stomachs, our clothes closets, our garages, our teeth, and our minds, we now may seek to ensure the health, safety, and leisure to enjoy more fully the good things on the first four levels．According to the passage, man will begin to think about such needs as housing and clothing only when________

can be the last and most satisfying level

解析：最后一段。最后的等级就是上了税等着政府做事，我们只享受就是了。选项C是正确的。Spending more on taxes to pay for government action against．．．付更多的税给政府，政府再有所行动……。不赋税，政府就不行动，第五个等级的满足就不会实现。

[单选题]More has been learned since 1945 about the chemical changes in the body than in all human history before ________ time．

that

解析：这里指的是在1945年之前的那个时期，并有强调之意。选项B是正确的。【句子大意】自从1945年以来，我们对人体化学变化的了解比1945年之前的整个人类历史所了解的还要多。

[单选题]By my 50th birthday, I________in my current profession for over 20 years．

will have been

解析：表示什么事情一直持续到将来，用将来完成时。选项D是正确的。【句子大意】到我50岁生日的时候，我就在现在的岗位干20年了。

[单选题]胃酸分泌减少时，促胰液素的分泌（　　）

减少

[单选题]右心室有 （　　）

动脉圆锥