在主/子窗体中，子窗体还可以包含子窗体的数量为( )。A．0． B．1 C．2 D

用括号内所给动词的适当形式填空，必要时可加助动词或情态动词。

    Last year my English class was difficult. First of all, it wasn't easy for me 1.______ (understand) the

teacher when she talked. 2.______ (begin)with, she 3.______ (speak) too quickly,and ! didn't understand every word. I was also afraid of 4.______ (speak) in class, because I thought my classmates 5.______ 

(laugh) at me. I 6.______ (make) complete sentences, either. Then I started to watch English-language

TV. It helps me a lot. Now I am enjoying 7.______ (learn) English and got an A this term.

1. _______2. _______3. _______4. _______5. _______ 6. _______7. _______

国际著名的生物信息中心有（）

A.NCBI

B.EMBL和EBI

C.ExPASy

D.RCSB

E.DDBJ

线路设备大修设计文件由设计说明书、设计图表和（）三部分组成。

诊断过敏性紫癜最主要的临床表现是（）

A.双下肢对称的紫癜样皮疹

B.胃肠道症状

C.关节症状

D.肾脏损害

E.血管神经性水肿

铁架加固设计一般为（）.

A.材料设计

B.组装设计

C.标准加固

D.构造设计