选择题：在数学中，有多种方程都可以表示心型曲线，其中著名的有笛卡尔心型曲线．如图，在直角坐标系中，以原点 O 为极点， x 轴正半轴为极轴建立极坐标系．图中

题目分类：高考
题目类型：选择题
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题目内容：

在数学中，有多种方程都可以表示心型曲线，其中著名的有笛卡尔心型曲线．如图，在直角坐标系中，以原点 O 为极点， x 轴正半轴为极轴建立极坐标系．图中的曲线就是笛卡尔心型曲线，其极坐标方程为 ρ＝1﹣ sinθ（0≤θ＜2π， ρ≥0）， M 为该曲线上一动点．

Susan ________Tina are good friends.

Susan ________Tina are good friends.

分类：高考题型：选择题

He was so tired that he fell asleep ___he went to bed.

He was so tired that he fell asleep ___he went to bed.

分类：高考题型：选择题

Swimming is, of course, interesting. But ______ we plan to go swimming, being sa

Swimming is, of course, interesting. But ______ we plan to go swimming, being safe must come first.

分类：高考题型：选择题

I don’t like Sun Cinema ________ it has bad service.

I don’t like Sun Cinema ________ it has bad service.

分类：高考题型：选择题

Mike and Jims room is tidy, ______ their sisters not.

Mike and Jims room is tidy, ______ their sisters not.

分类：高考题型：选择题