西汉和东汉以后选官制度有   ____    制和  ____  制。

增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词。

删除：把多余的词用斜线（\）划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意：1）每处错误及其修改均仅限一词；

2）只允许修改10处，多者（从第11处起）不计分。

Dear Tom,

    I have heard that you were to come to our school as an exchange student. I, on the behalf of our class, welcome you warm. Now, I'd like to introduce some details about our class.

    Our class is a very warm family. There are 50 students in our class, included 30 boys and 20 girls. You will find easy to join us since we all want to make friends with you. Whenever you get in trouble, you are ready to lend our hand to you. At last, I personally advice you to learn some basic Chinese to communicate with locally people. It is much easier for you to get on to teachers and classmates by speaking Chinese.

    Yours,

    Li Hua

如图是水面上两列频率相同的波在某时刻的叠加情况，以波源S₁、S₂为圆心的两组同心圆弧分别表示同一时刻两列波的波峰（实线）和波谷（虚线），S₁的振幅A₁=3cm，S₂的振幅A₂=2cm，则下列说法正确的是（   ）

    每féng____假期，我总要回到乡下老家去住几天，那里虽有些yáo____远，但却有我的表xiōng  dì____、表姐妹，还有和我一块玩耍过的小伙伴。他们只要一听说我来了，就会jí____时赶到奶奶家，围着我问长问短，在那里住上几天，会耳wén____目睹许多趣事。