室内操作大型技术相机，因自重沉，要选择（）来支撑。
A、垂直式单挂机架
B、独角架
C、可折叠三脚架
D、一般三脚架
参考答案：A
贫血、黄疸和脾肿大最可能是下列哪种疾病的临床表现（）
A.血红蛋白病
B.再生障碍性贫血
C.再生障碍危象
D.骨髓纤维化
E.慢性失血性贫血
用所给词的适当形式填空。
1. Thanks for ______ (help) me with my English.
2. There are all kinds of ______ (activity) for students in our school.
3. In the ______ (two) photo, I'm playing soccer.
4. Listen! The students ______ (sing) in the music room.
5. Look! Helen is ______ (shop) in the mall.
