Choose the best answer from the four choices marked A, B, C and D.[音频]
A. Japanese
B. Germans
C. Poles
D. Americans
查看答案
What letter is neither I or he?
Which four letters can frighten a thief?
从受精开始到胎儿发育成熟共经历
A. 28周
B. 32周
C. 36周
D. 38周
E. 40周
致畸敏感期指
A. 1-2周
B. 3-8周
C. 9-12周
D. 12-24周
E. 25-38周
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