retard（）

A、Parce qu'ils ont eu un accident.

B、Parce qu'ils ont perdu la nouvelle adresse de leurs amis.

C、Parce qu'ils ont un autre rendez-vous important.

D、Parce qu'ils se sont trompés du numéro de téléphone.

ntirely unexceptional” (line 24) primarily to emphasize that it______

A．functions much as the kidney of a rat functions

B．does not aid the camel in coping with the exceptional water loss resulting from the extreme conditions of its environment

C．does not enbale the camel to excrete as much salt as do the kidneys of marine vertebrates

D．is similar in structure to the kidneys of most mammals living in water-deprived environments

E．requires the help of other organs in eliminating excess salt

According to the author, what is not true in the democracy case？

A．Democracy may delay some urgent decisions.

B．Democratic government may prefer a small group"s interests.

C．Democracy will retard a country"s development.

D．Under democracy, one country can still be blessed with a strong government.

EXCRETE:

A．ingest

B．decide carefully

C．unite firmly

D．damage

E．arrest

A.分泌

B.掩饰

C.刁难

D.提炼

A.排泄

B.远足

C.忙碌

D.影响

A.排泄，分泌

B.抛，掷

C.恣意，一时放纵

D.基因型

A.极好的

B.使疏远

C.释放，排泄

D.不清晰的

water depends on where they live. Water gets into a fish's body through osmosis. Take a cell as an example, if there is more water outside of a cell than inside, water will try to flow into the cell until there is the same concentration of water on either side of the cell's membrane. The body of a fish acts the same way, (33) either absorbing or losing water depending on its surroundings.

Whether a fish absorbs or loses water is based on the fact that all fish must maintain a certain amount of salt in their bodies to stay healthy. (34) Fish that live in fresh water have a higher concentration of salt in their bodies than the surrounding water. Consequently, water continuously flows into the fish's body to attempt to dilute the amount of salt in the fish until it is equal to the amount of salt in the surrounding water.

Ocean fish have the opposite problem. Surrounded by salt water, their bodies contain a relatively lower concentration of salt than the ocean water. In this case osmosis causes the fish to constantly lose water in order to equalize salt concentration inside and outside the fish. To partially compensate for the water loss, ocean fish actually drink water through their mouths. And (35) to get rid of the excess salt they take in by drinking seawater, they excrete some salt through cells in their gills.

(30)

A．Water absorbing ability.

B．The cell's membrane.

C．Its surroundings.

D．The ability to maintain salt.

A.编造

B.示范

C.评估

D.排泄