问题
单项选择题
加工铸铁等脆性材料时，应选用（）类硬质合金。
A、钨钴钛
B、钨钴
C、钨钛
D、钨钒
答案
参考答案：B
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加工铸铁等脆性材料时，应选用（）类硬质合金。
A、钨钴钛
B、钨钴
C、钨钛
D、钨钒
参考答案：B
While most students in the USA are worrying about getting into their dream universities, others worry about a bigger problem. Students brought to the USA illegally, who have to leave a 36 on applications that need their Social Security number, know they will not be accepted 37 their outstanding grades and performance. The young immigrants 38 from the U.S. school system, but only up through high school. Their education often 39 there due to a 1996 federal law that bans states from offering in-state tuition rate(学费) to illegal immigrants 40 the state also offers it to all U.S. citizens. However, there may be some hope because of the DREA  M Act, which will be voted on in Congress (国会).The DREAM Act is a/an 41 aid program for the young illegal immigrants who entered the U.S. before they were 16. Those who apply for this program can get 42 and temporary residing (居住) status, which can be changed, once 43 , to a green card after six years. These immigrants can then use their newly acquired status to seek green cards  for their 44 . In this way, it can also provide citizenship for the illegal foreigners who brought their children to the US. “I don’t l  ive in fear of being driven out of this 45 ,” says Juan, a high school junior born in Mexico. “I live a normal life here 46 that now everyone is getting their driver’s license, and I can’t.” Juan came to the U.S. with his mother and older brother at eight. He is hoping for the DREAM Act to be 47 . While he admits that there is no obvious prejudice in high school, Juan 48 faces unfair racial treatment. “It 49 me when people joke around and ask me for my green card,” Juan explains. “I 50 , but deep down I know they are offending me for 51 I have no control over. I was born in Mexico, but my 52 is here.” His brother now attends a community (社区) college and plans to enter a univers  ity. Juan hopes to take a 53 path. “For long, I have no 54 that I can go to university” Juan says. “I know it’s going to be hard, but as long as I stay in this country, I have a/an 55 .”
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