在性激素对性行为激活作用的机制中,起关键作用的是( )
A. 多巴胺
B. 去甲肾上腺素
C. 乙酰胆碱
D. 谷氨酸
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如果许多肌纤维同时强有力地收缩会造成其自身损伤。可以检测到肌肉收缩时产生的张力,将信息传入脊髓,并通过中间神经元抑制运动神经元,在肌肉过于强大的收缩时起到抑制作用的是( )
A. 肌梭
B. 运动单位
C. 腱器官
D. 肌肉
Complete the sentences with the words or expressions in the box. (只需填写单词前大写字母)A. a variety of; B. help out; C. extra;D. allow;E. financial;F. tend; G. barrier;H. be regarded as; I. cope with; J. responsible(1) Which sales manager is _____ for the European market?(2) This shop sells _____ toys.(3) She's always willing to _____ when we're short of staff.(4) They have to _____a mountain of problems.(5) Breakfast is provided at no _____ charge.(6) This can _____ a great achievement.(7) His parents won't _____ him to stay out late.(8) Poor health maybe a _____ to success.(9) The company has enormous _____ firepower.(10) I _____ to go to bed earlier during the winter.
明日7時半に運動場()集まって、出発します。
A. で
B. に
このバスは大学の前()通りません。
A. を
B. で