患者，男，48岁，右下543和左下67缺失，余牙正常，设计纯钛整体铸造支架的可摘局部义齿，戴6个月后支架部分折断。检查：左下3、4区金属舌杆折断，舌杆厚1.5mm，折断面金属有缩孔，采用激光焊接金属舌杆。 下面关于焊接过程叙述中错误的是

激光焊接时后一焊点应覆盖前一焊点（）

A.40%

B.50%

C.60%

D.70%

E.80%

用括号里的词的适当形式填空。

1. He ____________ (watch) TV at nine last night.

2. Lucy ____________(clean) the house since she came back home.

3. Jane ____________ (study) Chinese these months, for she plans to visit China.

4. When I went into the classroom. I saw her ____________ (write) on the blackboard.

5. Helen comes from France, she is a ____________(欧洲人).

6. Li Lei said he ____________ (想念)his parents very much.

7. Miss Zhou is very popular in our school, she is a ____________ (成功)teacher.