D. Stanford and Yale together have courses similar to edX.

　　3. The underlined part in the text probably means “　”.　

　　A. Get ready for the difficulties

　　B. Get ready for this educational change

　　C. Get prepared to complete the online courses

　　D. Get prepared to make materials for the edX courses

　　4. What can be said about MITx according to the text?

　　A. It is first offered as part of the edX learning program.

　　B. It is another free MIT- Harvard online learning program.

　　C. It is a standard to recognize online learners’achievement.

　　D. It is a new kind of free online course of Harvard and MIT.

　　【参考答案】　1—4、CABC

　　阅读下列短文, 从给的四个选项 (A、B、C和D) 中, 选出最佳选项。

　　(2016·课标Ⅰ)Passenger pigeons(旅鸽)once flew over much of the United States in unbelievable numbers.Written accounts from the 18th and 19th centuries described flocks(群)so large that they darkened the sky for hours.

　　It was calculated that when its population reached its highest point，there were more than 3 billion passenger pigeons－a number equal to 24 to 40 percent of the total bird population in the United States，making it perhaps the most abundant bird in the world.Even as late as 1870 when their numbers had already become smaller，a flock believed to be 1 mile wide and 320 miles (about 515 kilometers) long was seen near Cincinnati.

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