25.内源性痛觉调制系统中起核心作用的部位是( )
A. 中脑导水管周围灰质
B. 下丘脑
C. 海马
D. 黑质
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26.下列物质不属于至痛因子的是
A. K+
B. H+
C. 5-HT
D. Na+
Listen!Chen Jie and Mike _______________(sing)now.
The small bear _____________ (climb) the tree at the moment.
Look! My brother ____________ (make) kites