unit 3 第4课时 ⅰ.单项填空从a、b、c、d四个选项中,选出可以填入空白处的最佳选项。 1.i can't find my keys. if you________them, please put them on the table. a.come from b.come about c.come across d.come out 答案:c 本题题意:我找不到我的钥匙,如果你在哪里看到的话,就将它们放在桌上。come across表示“(偶然)遇见;碰见;发现”。 2.they warn that one-third of those remaining are________of disappearing. a.at war b.at risk c.at peace d.at present 答案:b 本题题意:他们警告说,这些处境不妙的动物中将近三分之一正面临着灭绝的危险。at risk表示“处于危险中”。 3.we'll meet you in a week,________, on march 1. a.for example b.such as c.that is d.to start with