How ____ your weekend?[ ] A. are B. was

台湾岛是我过第一大岛，面积为三万五千七百五十九平方千米，写作______平方千米，保留一位小数约是______万平方千米．

下列框图中的物质均为初中化学常见的物质，其中A是建筑材料的主要成分，B属于氧化物，下图是它们之间的相互转化关系。请回答：

（1）写出下列物质的化学式：A                ，C                     。

（2）若G是红褐色沉淀，请写出F的化学式                       。

（3）若G是蓝色沉淀，请写出B→F的化学方程式                    。

阅读理解。

    Millions of people all over the world use the word OK. In fact, some people say the word

is used more often than any other word in the world. OK means all right or acceptable. It

expresses agreement or approval. 

    1______ Some people say it came from the Native American Indian tribe known as the

Choctaw (乔克托语). The Choctaw word "okeh" means the same as the American word okay.

Experts say early explorers in the American West spoke the Choctaw language in the nineteenth

century.

    But many people doubt this. Language expert Allen Walker Read wrote about the word "OK"

in reports published in the 1960s. He said the word began being used in the 1830s. 2______ Some

foreign-born people wrote "all correct" as "o-l-l-k-o-r-r-e-c-t", and used the letters OK. Other

people say a railroad worker named Obadiah Kelly invented the word long ago. They said he put

the first letters of his name-O and K-on each object people gave him to send on the train. 

    3______ The organization supported Martin Van Buren for president in 1840.They called their

group the OK club. The letters were taken from the name of the town where Martin was born-Old

Kinderhook, New York.

    Then there is the expression A-OK. It is a space-age expression. It was used in 1961 during the

flight of astronaut Alan Shepard. He was the first American to be launched into space. His flight

ended when his spacecraft landed in the ocean, as planned. Shepard reported, "Everything is A-OK."

4______ One story says it was first used during the early days of the telephone to tell an operator

that a message had been received.

    There are also funny ways to say okay. 5______ These expressions were first used in the 1930s.

Today, a character on the American television series "The Simpsons" says it another way. He says

okely-doke.

A. Some people say okey-dokey or okey-doke.

B. Still others say a political organization invented the word.

C. Therefore, it has become popular in that area from then on.

D. But many experts don't agree on what the expression means.

E. Still, language experts do not agree about where the word came from.

F. It was a short way of writing a different spelling of the word "all correct".

G. However, some experts say the expression did not begin with the space age.

痴呆综合征又称为（）。

A.急性脑病综合征

B.谵妄综合征

C.慢性脑病综合征

D.遗忘综合征

E.行为紊乱综合征

下列关于相变温度的叙述正确的是（）

A.当温度升高时脂质体双分子层中的疏水链可从有序排列变为无序排列

B.膜厚度减小，流动性减少，产生由胶晶态向液晶态的转变

C.相变温度取决于磷脂的用量

D.在相变温度时，脂质体膜的流动性增加，被包裹的药物具有最大的释放速度

E.膜的流动性直接影响脂质体的药物释放和稳定性