重症肌无力有以下特点()
A.神经冲动中乙酰胆碱释放过量
B.主损害横纹肌
C.肌无力症状晨重午轻
D.为代谢性疾病
E.多见上睑下垂
参考答案:B, E
根据下列句子的意思及所给的汉语提示,写出空缺处单词、固定短语或固定搭配的正确形式。
1. This is our _______ (三) time to plant trees.
2. I'm not really _______ (饥饿). I'll just have an ice cream.
3. Computer is one of the greatest _______ (发明). I can't imagine life without it.
4. They _______ (同意) us on some matters yesterday afternoon.
5. Mr. Smith gave us _______ (一条) advice on how to keep healthy.
读下边的半球图回答:
这一天,B地的昼长为()小时,我国大部分地区的昼夜长短情况是()。