在MySQL中，MyISAM存储类型的表支持外键。
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Which part(s) is/are omittable in an informal letter?
A. Return address
B. Closing
C. Signature
D. Greeting
E. Date
Which parts does a formal letter usually include?
A. Sender's address.
B. Dateline.
C. Inside address.
D. Salutation.
E. Body.
F. Complimentary close.
G. Signature.
人体情绪中医归纳为喜、怒、忧、思、悲、恐、惊等七种情况，简称为“七情”。每种情绪会引起人体“气”作用方向改变，导致气向下的是
A. 喜
B. 怒
C. 思
D. 恐
肝脏与（ ）相表里
A. 胆
B. 胃
C. 小肠
D. 大肠
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