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It’s one of our common beliefs that mice are afraid of cats. Scientists have long known that even if a mouse has never seen a cat before, it is still able to detect chemical signals released from it a

A. Toxoplasma gondii causes people strange and deadly diseases.
B. With certain infection the infectious disease cannot be cured completely.
C. Human beings infected by toxoplasma gondii will have permanent brain damage.
D. Toxoplasma gondii is harmful to human beings, but it does no harm to mice.

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“同底数幂的乘法”教学片断: 师生共同探索归纳总结出同底数幂的乘法法则后,进入知识巩固环节,教师出示例题:已知2x=16,2y=512,求2x+y的值。 解决本题时,需要学生能理解同底数幂的乘法法则,将公式am·an=am+n逆用,由于题目本身相对简单,大多数学生能获得解题思路并求得结果。(注:学生的回答是:2x+y=2x·2y=16×512=8192)一位学生出现了不同的声音,他的思路,先设法求

请阅读下列材料,根据材料所体现的主题做作文,题目自拟,题材不限,字数800字左右。《中国青年报》报道了一篇文章,是一位小学一年级学生的家长的来信。我用了6年时间,力图把女儿培养成“她自己”,告诉她每个人都是“独一无二”的,既不妄自菲薄,也不妄自尊大,让她慢慢明白“你有你的好,我有我的好”。我用了6年时间,试图让女儿明白:人与人之间关系的基础是互相尊重。我也深知,要想让孩子学会尊重,首先要对她尊重。

依据《普通高中英语课程标准》,语言有丰富的文化内涵。教师应根据学生的年龄特点和__________ ,逐步扩展文化知识的内容和范围。

David has tried 3 times to repair the clock. He will try __________ time after having a rest.

A. four
B. fourth
C. the fourth
D. a fourth

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