听力原文: A good way to see the USA is by car. Americans love their automobiles and in the past fifty years they have developed a vast network of roads and freeways to help them reach their destinations.
As few visitors have their own cars, renting one is the next best thing. You will need a valid driver's license and either international credit cards, or a deposit.
You should start out with a working knowledge of the road. Regulations vary from state to state and this can be very confusing to a newcomer. For example, in some states it is legal to turn right at a red light if there is no approaching traffic, while in other states you will be fined for this action. Throughout the country it is forbidden to pass a school bus when it has stopped to let off children.
The size of the country may startle you at first and you may be surprised at the spectacular physical beauty. When the first pioneers began to expand west into the wildness, the natural resources of the land seemed inexhaustible. Nearly 1,000 million acres of land was covered by virgin forest. Much of this was burnt off for farmland and it soon became apparent that the government would have to take action or the natural beauty of the land would be lost forever.
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A.A driver's license.
B.A passport.
C.An international credit card.
D.A deposit.
第4题
泡沫样细胞是指什么细胞 ()
A、脂肪细胞
B、骨髓瘤细胞
C、尼曼-匹克细胞
D、戈谢细胞
E、R-S细胞
第5题
下列哪种细胞PAS反应呈强阳性
A、尼曼,匹克细胞
B、戈谢细胞
C、吞噬细胞
D、有核红细胞
E、淋巴细胞
第6题
关于尼曼.匹克细胞和戈谢细胞的鉴别,错误的是
A、PAS染色尼曼-匹克细胞呈强阳性
B、MPO染色戈谢细胞呈阴性
C、MPO染色尼曼-匹克细胞呈阴性
D、NAP染色戈谢细胞呈阴性
E、NAP染色尼曼-匹克细胞呈阴性
第8题
酸性磷酸酶染色呈阳性反应的细胞是
A.尼曼-匹克细胞和戈谢细胞
B.戈谢细胞和B淋巴细胞
C.尼曼-匹克细胞和T淋巴细胞
D.T淋巴细胞和B淋巴细胞
E.戈谢细胞和T淋巴细胞
第10题
骨髓细胞学检查时,泡沫细胞是指
A.脂肪细胞
B.骨髓瘤细胞
C.尼曼-匹克细胞
D.戈谢细胞
E.R-S细胞
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