将物体放在凸透镜的左侧，离透镜距离为30cm时，在透镜右侧恰好能得到一个等大倒立

对眩晕发作可用药（）.

A.维生素B₆

B.培他司汀（敏斯朗）

C.50％葡萄糖

D.10％葡萄糖

E.0.9％生理盐水

根据句意，用括号中所给词的适当形式填空。

1. Those students were teaching _____,and their teacher wasn't there. They really work hard. (they)

2. Doing enough exercise is good for your _____. ( healthy )

3. When you catch a bad fever, you'd better _____ a good rest. ( take )

4. Long ago Maria _____ movies to TV shows. But now she doesn't like to watch TV any more. ( prefer )

5. Would you please _____ (not play) computer games again?

6. We Chinese are very _____ (friend) to the foreigners.

7. I'm really sorry for  ______ (lose) your English book again.

8. The children must not go to ______ (crowd) places.

9. Headache can often make you_____  (worry).

10. I'll buy four _____ (tomato) and two eggs for lunch.

下列事件过程的功能是：建立一个名为Data1的随机文件，存放角度值及这些角度的正弦函数值和余弦函数值，角度为1，2，3，…，90。请在空白处填入适当的内容，将程序补充完整。
Private Type Ang
K As Integer
Sinx As Single
Cosx As Single
End Type
_________________________’定义Ang类型的变量Ksc
Private Sub Form_Click()
Dim Y As Single
Open "C:\Datal.txt" For Random As #1 Len = 10
Put #1, 1, Ksc
Y = 3.14159 / 180
For i = 1 To 90
Ksc. K=i
______= Sin(i*Y)’给变量Ksc的正弦函数值赋值
Ksc.Cosx = Cos(i*Y)
Next i
Close #1
End Sub

分红保险可以有效降低通货膨胀的不利影响，保持寿险合同原保险金额的保障水平。

“新丝绸之路经济带”、“21世纪海上丝绸之路”，这是中国大国外交的战略构想。“一带一路”沿线国家基础设施建设欠缺，中国可通过资本输出带动消化过剩产能，争取沿线贸易规则的制定权，同时加强西部地区开发。实现“一带一路”战略构想（）。

①要高举和平发展的旗帜，积极主动发展与沿线国家的经济合作伙伴关系

②应遵循开放包容、互学互鉴、避免冲突的丝路精神，以政治合作为基石

③可将政治互信、地缘毗邻、经济互补优势转为务实合作、持续增长优势

④将促使西方国家以外的亚洲国家和经济体参与进来，成为中国的同盟国

A、①②

B、②④

C、①③

D、③④