生态系统中，______微生物通过______能直接吸收光能并同化CO2；______微生物分解有机化合物，通过______产生CO

Admiralty Sailing Directions are written with the assumption that the reader ______．

A.is familiar with all information contained in UKHO publications

B.knows nothing about any sailing directions

C.is lack of particular knowledge concerning the navigation of the area

D.has the appropriate chart before him and other relevant publications to hand

A.the other substances in the area are known

B.it is a localized area

C.it can be calculated quickly

D.the naturally occurring level is also known

A.the other substances in the area are known

B.it is a localized area

C.it can be calculated quickly

D.the naturally occurring level is also known

A．it is in a localized area

B．the naturally occurring level is also known

C．it can be calculated quickly

D．the other substances in the area are known

We acquire the greater part of our cultural codes by

A．creating a universe of discourse.

B．imitating the behavior. of others, especially those of the previous generation.

C．sharing the same experiences with other people.

D．taking in the various information we're given with no discrimination.

A. Object codes

B. Bar codes

C. References

D. Notes

______ information it is! Just put it into the computer.

A．How useful an

B．What useful

C．How useful

D．What a useful

What information is contained in all the four magazines？

A．Career.

B．Entertainment

C．College.

D．Business.

______ information it is! Just put it into the computer. ()

A．How useful an

B．What useful

C．How useful

D．What a useful