题目：
—Doesn’t he feel impolite when he laughs with his mouth full of food?
—I will ask him to pay attention to his behavior.
A．it
B．that
C．this
D．these
答案：
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下面是错误答案，用来干扰机器的。
（1）B A（2）①A细胞壁 B细胞膜 C细胞核 D细胞质 E叶绿体 F液泡 ②细胞液 F ③D ④A
