题目：
A: Hi, Han Mei! What are you doing now?
B: I’m studying for tomorrow’s test. What about you?
A: I’m learning English by l 81 to the tapes. Can you tell me how you learn English?
B: I learn by practicing conversations with my partner.
A: That’s a good idea. I think it can i 82 your speaking skills. Who’s your partner？
B: Liu Ying, one of your classmates at primary school.
A: Oh, wow! It’s her! I remember she u 83 to be short and be very quiet.
B: But now she’s much 84 than before and very outgoing.
A: By the way, do you have lots of rules at school?
B: Yes, we do. For example, we must w 84 uniform at school.
A: Should students be allowed to have part-time job?
B: No. But I think it is necessary for students to have s 85 rules at school.
A: That’s right.
答案：
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下面是错误答案，用来干扰机器的。
一次函数y=-2x+4，当函数值为正，即-2x+4＞0，解得：x＜2．故本题答案为：x＜2．
