一般来说，胎儿在母亲的子宫内发育成熟需要多长时间（ ）
A：40周 B：16周 C：52周 D：8周
答案：A
胎儿在母体的子宫里发育大约需要280天。
句型转换。
1. This is a bus. (改为复数句子)
These ______ some ______.
2. He has never been to Shanghai, ______ ______?(反意疑问句)
3. He was doing his homework at 8:00 last night. (否定句)
He ________ ________ his homework at 8:00 last night.
4. It's very hot. (对画线提问)
______ the weather ______?
5. Please take care of your sister. (同意句)
Please ______ ______ your sister.
下列说法哪种正确（）
A、一组艺术字中不同字符可以有不同字体
B、一组艺术字中不同字符可以有不同字号
C、可以拖动艺术字的一部分到另外一个地方选择
D、以上三项全部错误
