— _____my dad ______ my mom likes it. They both like classical music.

2013年CCTV 3•15晚会曝光黄金造假：个别不法商贩为牟取暴利，在黄金中掺入少量金属铱颗粒．已知黄金的熔点是1064.6℃，铱的熔点是2443．O℃，可以有效检测黄金制品中有无铱颗粒的手段是（　　）

阅读短文，下列问题

                                                                                                                  A

                                                                                                        Mother’s Day

      Mums do a lot of hard work. They cook and clean for us—their children. They also encourage us and give us support. Mother’s Day is the time for us to say “Thank you “to our mums.

      In most countries, people celebrate Mother’s Day on the second Sunday in May every year. On this day, people like to buy flowers and make special Mother's Day cards for their mums.

     Mother's Day is not only about gifts. We can help our mums do the housework. We can take them to the park or the cinema. Sometimes a simple hug or saying “I love you, Mum” is the perfect gift for our mum.

     Mother's Day is about love. If you love your mum, why not plan a special Mother’s Day for her?

皮肤能防止病菌侵入人体，与这种免疫属于同种类型的是（　　）