人类对遗传物质本质的探索经历了漫长的过程，下列有关叙述正确的是（） A.标本染色较深

下列临床表现对诊断骨髓瘤最有价值（）

A.50岁以上的男性

B.全身性疼痛

C.尿中出现本周蛋白

D.进行性贫血

E.血清钙及球蛋白升高

根据句意及首字母把下列单词补充完整，使句意完整。

1. We don’t have enough food, s_______ some bread for tomorrow.

2. My brother is an e_______, his job is to design a building.

3. I am going to t_______ around the world.

4. No.4 Middle School is going to h_______ a sports meeting this term.

5. The little dog becomes bigger and bigger, it g_______ very quickly.

6. Can you m_______ your bed, please?

7. Zhang Qiang becomes a pilot at last , his d_______ comes true.

8. He likes painting, so he wants to be an a_______.

9. He b_______ a big house for his parents last year. They lived in the house comfortably.

10. You become a little heavier, you’d better keep f_______.

化学反应中，有时存在“一种物质过量，另一种物质仍不能完全反应”的特殊情况。下列反应中属于这种情况的是 [ ]

①过量的锌与18 mol/L的硫酸反应；

②过量的氢气与少量氮气在催化剂存在下充分反应；

③浓盐酸与过量的MnO₂；

④过量铜与浓硫酸；

⑤过量稀硝酸与银反应；

⑥过量稀硫酸与块状石灰石

A. ②③④⑥

B. ②③⑤

C. ①④⑤

D. ①②④④⑤⑥

锅筒筒体的内径偏差可用钢卷尺外绕筒体一周进行测量。( )

写作演讲稿的主体部分应做到：（）。

A.脉络清晰，紧扣主题

B.层次分明，结果严谨

C.内容充实，语言简练

D.节奏适度，张弛有致