（）是指记录和包含信息的各种物质载体如文献、实物、广告、数据库等。
A.生产型信息源
B.存储型信息源
C.负载型信息源
D.交流型信息源
参考答案：C
---What do you think has made Tom feel down?
---- ______ his seat in the election, I think.
A．As he lost
B．Lost
C．Losing
D．Because of losing
+2.00DS以上的远视的先天性内斜视患者应首先考虑（）
