题目

根据下面短文内容，在短文的空格处填上一个恰当的词，是短文完整、通顺。   Now students’ English handwriting(书法) gets worse and worse. That makes their teachers feel worried. Is your English handwriting beautiful? If   76  , here are four steps that really work!◆     Use paper with lines   Using paper with lines can keep you writing straight   77   of up or down when you write English words or sentences. Those lines on the paper can help you to write words in the right size. Be sure to   78    the lined space completely. And make sure t下列关于酶的叙述，正确的是(　　) ①酶是活细胞产生的　②酶都有消化功能　③蛋白质都是酶　④酶具有多样性　⑤酶可促进反应，与酸碱度无关　⑥淀粉酶能促进淀粉水解 A．①②③ B．①②④⑤ C．①②④⑥ D．①④⑥