语音知识(共5小题；每小题1分，满分5分)

从每小题的A、B、C、D四个选项中，找出其画线部分与所给单词的画线部分读音相同的选项，并在答题卡上将该项涂黑。

1.success

A.officical                                                              B.excuse

C.correct                                                                D.exciting

2.society

A.achieve                                                               B.friend

C.science                                                                D.believe

3.theirs

A.thread                                                                 B.smooth

C.thirsty                                                                 D.health

4.raise

A.remain                                                                B.certain

C.mountain                                                             D.bargain

5.compare

A.company                                                             B.continue

C.common                                                              D.concert

洗擦器的主要作用是（）。