If you couldn’t speak or answer a question., we might say, "_______________" A: He looks like the cat that ate the canary. B: Has the cat got your tongue? C: You let the cat out of the bag.

若Animal是Cat,Dog的父类，则下列选项中，正确的是（） A: Animal animal = new Cat(); B: Animal a = new Cat(); Cat cat = (Cat) a; C: Animal animal = new Dog(); D: Cat cat = (Cat)new Dog();

5 Didn't you see that'blue cat/blue'cat? A: 'blue cat B: blue'cat

若Animal是Cat,Dog的父类，则下列选项中，正确的是（） A: Animal animal = new Cat(); B: Cat cat = (Cat)new Animal(); C: Animal animal = new Dog(); D: Cat cat = (Cat)new Dog();

cat testfile的输出与下面哪个命令相同？（） A: cat＞testfile B: cat＜testfile C: cat＞＞testfile D: cat＜＜testfile

Under the tree (). A: did a cat lay B: did lay a cat C: a cat lay D: lay a cat

'lazy cat'.match(/[cat]/g)与'lazy cat'.match(/(cat)/g)的匹配结果是一样的

She (speak) very well now. A: can speak B: could speak C: is speak D: could spoke

I wish I ______ English fluently. A: can speak B: could speak C: speak D: may speak

He was too excited _________. A: speak B: to speak C: not to speak D: speaking