In the view of todays scientists, autism might result fromA．pesticides or antibodies in a

Which of the following might result in the divisions within the "autism community"?

A．The sophistication of autism.

B．The enrollment of some autism patients in colleges.

C．Some autism patients never speak an intelligible word.

D．The simplicity of autism.

It can be inferred from the first paragraph that

A．more and more children have got the symptoms of autism.

B．few people are in terror of the symptoms of autism.

C．autism now is widely spread throughout the world.

D．the culture of autism now is heatedly discussed and reported.

From the last paragraph we learn that

A．immigration may slow down the ageing of Europe"s population.

B．immigration may lead to instability of the European labor market.

C．Europe is more generous to immigrants than the United States.

D．Europeans will become more xenophobic as more immigrants come in.

By saying "The toothpaste is out of the tube", the author probably means that

A．the unskilled immigrants have already been here and will certainly not return.

B．the unskilled immigrants have dragged down wages and will continue to do so.

C．children of unskilled immigrants have done poorly in school and will likely to drop out soon.

D．the younger generation of unskilled immigrants will see their numbers grow.

It has become a generally accepted view that the rich countries governments should

A．try to admit and attract highly skilled immigrants.

B．introduce green cards of their own countries.

C．create more jobs for the unskilled immigrants.

D．refuse to admit unskilled immigrants.

The probable title of this text is

A．A Breakthrough in Archaeology.

B．A New Discovery—Snowy River.

C．Snowy River—An Underground Wonder.

D．Unveiling Snowy River.

Some scientists believe floods help form. the layer of calcite in that

A．Snowy River is covered with manganese crust.

B．the formation looks like a white river span.

C．they found the passage flowing with water incidentally.

D．it is deep in the cave behind locked metal gates.

Snowy River is designated as a national conservation area because

A．that can prevent it from any human activity which affects the water flows.

B．the water flows need protecting and the research needs funding.

C．the microbes uncovered in the cave deserve our protection.

D．the scientific research on the River ought to be funded.

Which of the following statements is true about the Snowy River?

A．It extends its passage beneath the hills of southeastern New Mexico.

B．Its attraction is a crust of tiny crystal.

C．It is a wonder underground, which looks like a white river four miles long.

D．Some well-known microbes are uncovered, which makes the River unique.

According to the text, "seasoned"(Line 1, Paragraph 1)probably means

A．brave.

B．hardworking.

C．experienced.

D．breathtaking.