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【单选题】
Rats are really dangerous creatures. They carry disease such as bubonic plague ratbite fever. They may also attack babies. Another reason why rats are not very desirable is that they destroy things. They will chew on books and other paper and will even eat through pipes. They will get into our food and ruin it. The topic sentence of this passage is .A.
the first sentence
B.
the third sentence
C.
the fourth sentence
D.
the last sentence
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反馈参考答案：
举一反三
【单选题】大理石装修的房屋彰显富丽堂皇，但当食醋不慎滴在大理石地面上时，会使其失去光泽，变得粗糙，下列能正确解释此现象的是（ ）
A.
食醋中的水使碳酸钙溶解
B.
食醋中的醋酸将碳酸钙氧化
C.
食醋中的醋酸起了催化作用，导致碳酸钙分解了
D.
食醋中的醋酸与碳酸钙发生了复分解反应
【简答题】The common currency of the Euroland suggests that the EU is on the way to become a political integrity.
【单选题】下列运算正确的是（ ）
A.
a 3 +a 3 =2a 6
B.
a 6 ÷a ﹣3 =a 3
C.
a 3 a 3 =2a 3
D.
（﹣2a 2 ） 3 =﹣8a 6
【简答题】干细胞是体内存在的一类具有自我更新和分化潜能的细胞，可区分为（）和（）两大类。
【简答题】唐代女子发饰主要不包括() A簪 B钗 C发夹 D步摇
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