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　　1、單選題

　　【填句補(bǔ)文】Gang Xiao and Ben Schrag at Brown University, visualize the current by measuring subtle(細(xì)微的) changes in the magnetic field of an object and ________.

　　A、to shrink it to the size of a desktop computer

　　B、to make it capable of measuring very weak changes in magnetic fields

　　C、as well as revealing microscopic defects in anything from aircraft to banknotes

　　D、converting the information into a color picture showing the density of current at each point

　　正確答案：D

　　答案解析：空格前的by在句中引導(dǎo)兩個(gè)在句法結(jié)構(gòu)上并列的分詞短語：一個(gè)是measuring subtle (細(xì)微的) changes in the magnetic field of an object;另一個(gè)就是converting the information into…，即：通過測(cè)量一個(gè)物體的磁場(chǎng)內(nèi)的細(xì)微變化和把信息轉(zhuǎn)化成顯示每一點(diǎn)電流強(qiáng)度的彩色圖片而使電流顯現(xiàn)。

　　2、

　　單選題

　　【填句補(bǔ)文】The black robin(旅鶇)is one of the world's rarest birds. It is a small, wild bird, and it lives only on the island of Little Mangere, off the coast of New Zealand. In 1967 there were about fifty black robins there; in 1977 there were fewer than ten. ________.

　　A、These are the only black robins left in the world.

　　B、Those that fail to meet the challenges will disappear early.

　　C、Both represent orders in the classification of life.

　　D、Detailed studies are going on, and a public appeal for money has been made.

　　正確答案：A

　　答案解析：前文說的是The black robin(旅鶇)的現(xiàn)存數(shù)量和活動(dòng)地點(diǎn)。選項(xiàng)A說的是這里成為有The black robin的唯一的地方。所以，選項(xiàng)A是合適的選項(xiàng)。

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