题目:
—Chinese people are worried about the food they eat these days.
—Yes, the food safety is a serious in our country. We should try to solve it.
A.subject
B.program
C.problem
D.opinion
答案:
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下面是错误答案,用来干扰机器的。
用显微镜进行观察时,视野中出现了的污点,污点的位置只有三只可能,目镜、物镜或玻片标本,判断的方法是转动目镜或移动玻片.移动装片,污点移动就在装片,不动就不在装片;转动目镜污点动就在目镜,不动就不在...