选择性培养基要选择融合的（） A.瘤细胞与瘤细胞 B.脾细胞与脾细胞 C.脾细胞与瘤

A good reader is very much like a driver. He must change his reading speed to fit(适应)what he is reading and what he is reading for, just as a driver does to fit the road situation.

A good reader may read at 1,000 WPM(每分钟…词 )when he looks for something for a report in the library. But once he finds what he needs, he may slow down to 100 WPM. A good reader may read newspapers and story books at 600 WPM. But he may read his science or maths books at 150 WPM. Just as a driver has a wide change of driving speed, so a good reader has a wide change of reading speed.

小题1:The writer thinks that a good reader can____.

A．read at 1,000 WPM

B．read as fast as he can

C．change the reading speeds as he needs

D．spend more time reading小题2:A good reader may read fastest____.

A．when he reads newspapers and story books

B．when he reads something most useful to him

C．when he is trying to work out a maths problem

D．when he is trying to find something for his report小题3:Which is the best title for this passage?

A．The Importance of Having Fast Reading Speed

B．A Good Reader and His Reading Speed.

C．The Best Way of Fast Reading

D．The Difference Between Driving and Reading

（1）在25°C时，已知0.1mol/LHCN溶液的PH=4，0.1mol/LNaCN溶液的pH=12．现将0.2mol/L的HCN溶液和0.1mol/L的NaOH溶液等体积混合后，溶液中各种离子的浓度有大到小的关系为______．

（2）常温下，将0.01molNH₄Cl和0.002molNaOH溶于水，配制成0.5L混合溶液．试回答（填写数据）：

①溶液中c（NH

+4

）+c（NH₃•H₂O）一定等于______

②溶液中n（OH^-）+n（Cl^-）-n（NH⁺₄）=______．

现有四种短周期元素X、Y、Z、W，其中：

① X、W原子的电子层数与最外层电子数之比分别为3:1和1:3

② Y原子是元素周期表中原子半径最小的

③ Z是形成化合物种类最多的元素

回答下列问题：

（1）X元素在周期表中的位置是　　　　　　　　　 　。

（2）上述四种元素中所能组成的含有非极性共价键的化合物的分子式　　　　　　（填其中一种即可）。

（3）化合物X₂W₂的电子式是　　　　　　 。

（4）向含1 mol Na₂SiO₃的溶液中缓慢通入2 mol的ZO₂，反应的离子方程式是　　　　　 　。

（5）由Y、Z、W元素中的两种或三种可以组成多种分子，其中含有10个电子的分子是_________（填化学式）。

（6）向25.00 mL的Y₂Z₂W₄溶液中加入5.00 mL 0.50 mol/L酸性KMnO₄溶液恰好完全反应，得到ZO₂和Mn²⁺，则此种Y₂Z₂W₄溶液的物质的量浓度是　　　　 　mol/L。

男性，35岁，发现右颈前肿块2年，无明显增大，近发现颈右侧淋巴结肿大，门诊检查：右甲状腺上有一孤立质硬结节约2.5cm，右胸锁乳突肌下外侧淋巴结肿大2～3个，质偏硬，血清降钙素200ng/ml（）

A.甲状腺 * * 状癌

B.甲状腺未分化癌

C.甲状腺髓样癌

D.甲状腺滤泡腺癌

E.甲状腺隐灶癌

F.甲状腺转移癌

G.甲状腺鳞癌

H.甲状腺恶性淋巴瘤

热熔式复合中，用冷却装置将粘合剂冷却固化。