Some general corrosion protection techniques include material selection, ___________, ___________, and___________

A、以较少的资源投入而获取较多的服务 To acquire more services with less resource input

B、以较多的资源投入而获取较多的服务 To obtain more services with more resource input

C、以较少的资源投入而获取较少的服务 To obtain less service with less resource input

D、以较多的资源投入而获得较少的服务 To obtain less services with more resource input

The material used extensively as electrolytic protection around bronze propellers is ______.

A.Brass

B.Copper

C.Lead

D.Zinc

A、acetyl-CoA

B、succinyl-CoA

C、malonyl-CoA

D、glycine

E、Fe2+

听力原文： Generalizing about education in the United States involves some hazard because education is decentralized and standards vary from place to place. What is more, diversity is the hall-mark of American education.

Education is largely a public function in America, but religious and private institutions do sponsor schools. These private schools, particularly in the primary and secondary field, are now enjoying a resurgence.

Most children in America begin school in a kindergarten class at age 5. This follows with eight years of primary education, then four years of high school. Education is compulsory until about age 16. The existence of large minorities, many with a primary language other than English, complicates the educational process. Many Americans do not believe that their school standards are high enough. The high rate of functional illiteracy gives credence to this charge.

Higher education in America is widespread with about 1,800 post-secondary institutions. These include two-year community colleges, four-year undergraduate colleges and universities, and many schools which have extensive graduate programs. Some schools are privately funded, but most receive the bulk of their funding from public sources. There is a great range of quality between higher educational institutions and, some universities have outstanding academic records. These quality differences may be overemphasized for many non-prestige schools have excellent programs. In the long run, the individual determines the education he gets.

(33)

A．There are not accepted standards.

B．There are too many schools.

C．Decentralization brings much diversity.

D．No one has critically studied the subject.

听力原文： Generalizing about education in the United States involves some risk because education is spread around and standards vary from place to Place. Even more, diversity is the feature of American education.

Education is largely a public function in America but religious and private institutions do sponsor schools. These private schools, particularly in the primary and secondary field, are now enjoying a revival.

Most children in America begin school in a kindergarten class at age five. There follows eight years of primary education, then four years of high school. Education is compulsory until about age 16. The existence of large minorities, many with a primary language other than English, complicates the educational process. Many Americans do not believe that their school standards are high enough. The high rate of functional illiteracy gives evidence to this charge.

Higher education in America is widespread with about 1,800 post-secondary institutions. These include two-year community colleges, four-year undergraduate colleges and universities, and many schools which have extensive graduate programs. Some schools are privately funded, and more receive the majority of their funding from public sources. There is a great range of quality between higher educational institutions and some universities have outstanding academic records. These quality differences may be overemphasized for many unfamous schools have excellent programs. In the long run, the individual determines the education he gets.

(30)

A．There are no fixed standards.

B．Spreading brings much diversity.

C．There are too many private schools.

D．Fund origins are various.

I have read the material several times but it doesn't make any ______ to me.

A．meaning

B．importance

C．sense

D．significance