制备石英光纤有多种方法，其中等离子体化学气相沉积法的缩写是（）
A.PCVD
B.CVD
C.MCVD
D.AVD
参考答案：A
句型转换。
1. Mike's going to Hawaii on August 3rd. (改为一般疑问句)
______ Mike ______ Hawaii on August 3rd?
2. Dave is studying for the math test this weekend. (对画线部分提问)
______ Dave ______ this weekend?
3. I'm going there with my grandfather. (对画线部分提问)
______ you ______?
4. How's the weather there? (同义句转换)
______ the weather ______ there?
5. Show me your ID card. (同义句转换)
Show ______.
模型锻造
3rd. (改为一般疑问句)