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（1）为了保证实验效果应选择较 ▲ （填薄或厚）的玻璃板．
（2）实验时玻璃板a应与水平桌面 ▲ 放置．
（3）沿水平桌面移动蜡烛c前，应先将蜡烛 ▲ 点燃．
（4）该实验最好在 ▲ （填较暗或较亮）的环境中进行．
（5）如果在蜡烛像的位置放一个光屏，光屏上_▲____承接到像（选项“会”或“不会”），这说明平面镜所成的像是__▲____像（选填“虚”或“实”）． 查看习题详情和答案>>
【小题1】 —The old man lives alone but he doesn’t feel lonely.
—Sometimes he goes to town to see his son..
| A．without any help | B．with some help | C．by himself | D．a hard life |
—Yes, he is handsome and outstanding.
| A．Are…popular with | B．Do…take little pride in |
| C．Do…take pride in | D．Do…feel like |
—I believe your dream will come true if you keep on working hard.
| A．you can imagine your dream | B．you can complete your dream | C．you can remind your dream | D．you can realize your dream |
—Yes, but in a word, we should care for our health at any time.
| A．in short | B．no doubt | C．in detail | D．in fact |
—Yeah, doing that can build me up.
| A．cheer me up | B．make me stronger |
| C．keep me active | D．change me more |
(1)该特异性免疫属于 免疫，图中b细胞在人体内可以来自 细胞。
(2)图中a、b、c、d能够识别抗原的是 。（填字母）
(3)若图中所示的抗原为酿脓链球菌，因其表面的抗原决定簇与人心脏瓣膜上的一种物质的表面结构十分相似，物质d向心脏瓣膜发起进攻，使人患上风湿性心脏病，这属于免疫失调中的 病。
(4)当抗原经过⑤⑥过程时，人体内产生d的主要特点是数量多、速度快，与合成与分泌d有关的细胞器有 、 、
、 。
(5)研究发现，HIV病毒的增殖需要逆转录酶，从遗传物质分析，研究HIV疫苗比较困难的主要原因是 。 查看习题详情和答案>>
| （A）I am Bob．I like school things and I have a great collection．I have three pens，five pencils，six rulers and two erasers．They are in my pencil case，I have a nice pencil sharpener too．It’s blue and it's in my backpack．I take my backpack to school every day． |
| （B）I am Jimmy．I like sports and I have a sports collection．I have five soccer balls，two basketballs，five ping-pong balls，six tennis rackets and four volleyballs．I like tennis and I play tennis with my friends every afternoon． |
| （C）I am Salina．I don’t like school things and I don’t like sports．I only like my toys（玩具）。 |
【小题2】Bob’s pencil sharpener is blue．
【小题3】Salina doesn’t like sports．
【小题4】Jimmy doesn’t have soccer balls．
【小题5】Jimmy plays basketball with his friends every afternoon． 查看习题详情和答案>>
1根据A、B、C三个表格所提供的信息，判断正误，正确的用A表示，错误的用B表示。
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（A）I am Bob．I like school things and I have a great collection．I have three pens，five pencils，six rulers and two erasers．They are in my pencil case，I have a nice pencil sharpener too．It’s blue and it's in my backpack．I take my backpack to school every day． |
|
（B）I am Jimmy．I like sports and I have a sports collection．I have five soccer balls，two basketballs，five ping-pong balls，six tennis rackets and four volleyballs．I like tennis and I play tennis with my friends every afternoon． |
|
（C）I am Salina．I don’t like school things and I don’t like sports．I only like my toys（玩具）。 |
1.Bob has three pencils．
2.Bob’s pencil sharpener is blue．
3.Salina doesn’t like sports．
4.Jimmy doesn’t have soccer balls．
5.Jimmy plays basketball with his friends every afternoon．
查看习题详情和答案>>