New Findings on Cancer

Scientists have learned more about the way cancer spreads from one place in the body to another. Once it spreads, it gets more difficult to treat. Cancer is a disease of uncontrolled cell growth. Traditional thinking is that cells simply break off the main cancer, travel through the blood and grow in other organs.

But the new findings suggest there is more to this process. Researchers found that cells from the main tumor（瘤） send out messengers（送信者）. These prepare the new organ for a secondary tumor.

It works this way. The primary tumor releases （釋放） proteins called growth factors into the blood. They signal cells at the target organ to produce a sticky protein, called fibronectin. Fibronectin attaches to the surface of bone marrow （骨髓） cells. The result is a kind of landing area for cancer to arrive and grow into a secondary tumor.

The bone marrow (骨髓）cells help make vessels （血管） for blood to pass through and feed the cancer cells. The researchers believe that without the bone marrow cells, the tumors could not land on the new organ and grow.

Scientists from Cornell University in Ithaca, New York, led the research. The study appeared in the publication Nature. It involved laboratory mice. The researchers killed off bone marrow cells in the animals and replaced them with special new ones, which were brightly colored, so the researchers could observe them. The mice were then injected with lung cancer cells.

The researchers were surprised when the bone marrow cells reached the lungs days before any cancer cells. They found that the bone marrow cells arrived to prepare the lungs for the cancer to spread. Other tests led to similar findings.

The researchers believe they would find the same result in humans. They say knowledge of the process could lead to new ways to fight cancer.

1.It is more difficult to control the cancer after it spreads

A.Right　B.Wrong　C.Not mentioned

正確答案:A

解析:該題說(shuō)的是：癌癥擴(kuò)散了之后就更不好控制了。第一段中間提到一旦擴(kuò)散，就更不容易治療了。這里的“treat”與題干中的“control”都是對(duì)癌癥的治療的意思

2.People used to believe that some cancer cells just got away from main cancer and travelled through blood vessels to other organs and grow there

A.Right　B.Wrong　C.Not mentioned

正確答案:A

解析:該題說(shuō)的是：過(guò)去人們認(rèn)為一些癌細(xì)胞從主細(xì)胞上分離，通過(guò)血管移動(dòng)到其它器官并在那里生長(zhǎng)。第一段最后一句就是這個(gè)意思。其中的“Traditional thinking”就是傳統(tǒng)的認(rèn)為，也就是過(guò)去認(rèn)為。因此正確

3.Actually, the primary tumor sends out proteins instead of cancer cells

A.Right　B.Wrong　C.Not mentioned

正確答案:A

解析:該題說(shuō)的是：事實(shí)上，腫瘤主細(xì)胞釋放出的是蛋白質(zhì)，而不是癌細(xì)胞。第三段開頭提到“The primary tumor releases proteins”意思就是主腫瘤釋放出蛋白質(zhì)

4.The bone marrow cells play an unimportant role in the nourishment of the secondary tumor

A.Right　B.Wrong　C.Not mentioned

正確答案:B

解析:該題說(shuō)的是：骨髓細(xì)胞在繼發(fā)瘤的營(yíng)養(yǎng)補(bǔ)給方面不起重要作用。從第四段可知，骨髓細(xì)胞能夠制造血管，為繼發(fā)瘤細(xì)胞輸送營(yíng)養(yǎng)。因此提高說(shuō)法不正確

5.The researchers killed a lot of mice for the laboratory test

A.Right　B.Wrong　C.Not mentioned

正確答案:B

解析:該題說(shuō)的是：為了實(shí)驗(yàn)研究院們殺死了許多老鼠。第五段提到“The researchers killed off bone marrow cells in the animals and replaced them with special new ones, which were brightly colored,”這句話的意思是研究員們殺死了老鼠體內(nèi)的骨髓細(xì)胞，并代之以做了發(fā)光標(biāo)記的新骨髓細(xì)胞。就是說(shuō)，他們殺死的并不是老鼠，而是細(xì)胞。因此題干錯(cuò)誤

6.Lung cancer cells reached the lung of the lab mice much earlier than the bone marrow cells

A.Right　B.Wrong　C.Not mentioned

正確答案:B

解析:該題說(shuō)的是：肺癌細(xì)胞比骨髓細(xì)胞更早到達(dá)了老鼠肺內(nèi)。倒數(shù)第二段中提到骨髓細(xì)胞比癌細(xì)胞早到達(dá)肺部好幾天。所以題干的說(shuō)法是錯(cuò)誤的

7.All the mice involved in the lab test died of lung cancer at last

A.Right　B.Wrong　C.Not mentioned

正確答案:C

解析:該題說(shuō)的是：用于實(shí)驗(yàn)的老鼠最終全部死于肺癌。文章中并沒(méi)有提到老鼠最后的生死。因此選C

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