下列哪个征象不是亚急性甲状腺炎的常见表现（） A.甲状腺吸131I率降低 B.血清甲

If the coupon payments are reinvested at the coupon rate during the life of the issue, then the:（）

A. yield to maturity is greater than the realized yield.

B. yield to maturity is less than the realized yield.

C. yield to maturity cannot be determined from the information given.

化学变化中的最小粒子是（　　）

A．分子

B．质子

C．原子

D．中子

蝗虫的身体由很多_______构成，分为______________三部分，在相对干燥的环境中，身体表面的______能防止体内水分的散失；有三对_____和两对______，使它们能够不依靠水的浮力也能支撑身体和运动；它们体内具有能在空气中呼吸的器官比如气管；还有发达的感觉器官比如________，能够对多变的环境及时做出反应。所以蝗虫能适应_______生活。

根据句子意思，用括号中所给单词的适当形式填空。

小题1:Tom is busy preparing for a party to celebrate his sister’s     (twelve) birthday.

小题2:My cousin is made         (study) with his new friends in USA.

小题3:—What’s your favorite fruit?

—I like apples __________ (well).

小题4:On            (child) Day, our classmates sent a lot of stationary to the school in the disaster area.

小题5:So they ordered Armstrong to cut the __________ (fly) short and he successfully brought the spacecraft down into western Pacific Ocean.

小题6:Mother is busy __________ (prepare) for the coming big dinner in the kitchen.

小题7:—How was your day off yesterday?

—Perfect! It was my grandma’s ________(eighty)birthday. We had a big cake.

小题8:—Will you take part in the Chinese writing competition next week?

—Sure. I consider it as a chance to prove________ (me).

小题9:If you want to improve your English, you should practice________ (speak) it as much as possible in and out of class.

小题10:—You will be ________ (welcome) if you speak loudly in the place like this.

— I’ve got it. Thank you.

简述朱熹关于教育阶段的划分和主要教育内容。