2.in danger of extinction还是in danger of becoming extinction
3.An estimated 40 fireballs per second was reported(or observed?) in XX, meteorites at least as bright as Venus. 其中有项是An estimation of 40 fireballs per second was reported in XX…
4.Country T has three kinds of climates, 划线开始 D. ranging from A, with B, to C E. ranging from A to B to C 我选 E, (A,B,C 是 3 regions’ climates)
5.not in a and b, but rather in c
6.LIKE MANY SB. DO STH, SO WERE... 只有一个选项是 MANY OTHER SB.DO STH. 我选了它.
7. ...., AN ESTIMATED 40 FIREBALL WERE OBSERVED, 另一个是AN ESTIMATE OF 40 FIREBALL WERE OBSERVED. 我选了前面一个. 难道错了?
8. SINCE MANY BIRD POLLUTED KEPT FALLING DOWN FROM THE SKY ABOVE FREEWAY, IT PROMOTED SB. DO STH. 有一个选项是HAVING BIRD...FALLING DOWN..., PROMOTING SB. DO STH.
9.The earthquakes ----------------------- in ************ A do not occur in random scattered areas, but concentrate B do not occur rin andomly scattered areas, but concentrate C are not randomly scattered, but concentrated D are not random scattered, but concentrate E are not randomly scattered, but have concentrated
10.both-and, different from/unlike, not only-but also , earthquake strikes US/earthquake strikes in US(不确定）
11.….in mathematics….of its …., 主句 选项：参考没有划线的部分知道mathematics当了单数对待，所以选项里边可以排除三个都含有them的，然后并列排除。
13.would have …. to outstrip and to…, and would to rave 选项有outstriping and v ing. 我就选了A，因为其他的都不对等，不过A中是would have和to rave 对等了。to outstrip and to…时表示目的定语。 我不确认