Which of the following call be inferred from the passage about cotton production in the United States after the introduction of Whitney's cotton gin（）
A. More cotton came from sea island cotton plants than befor
B. More cotton came from short-staple cotton plants than befor
C. Most cotton produced was sold domesticall
D. Most cotton produced was exported to Englan
According to the passage, which of the following contributes to a dull sound being produced by a violin（）
A long fingerboard
B. A small body
C. High string tension
D. Thick strings
The word "they" in line 23 refers to（）
A. Civaldi and Tartini
B. thinner strings and a higher string tension
C. small changes
D. internal structure and fingerboard
A型题 非甾体抗炎药(NSAID)不包括
A. 吲哚美辛
B. 布地奈德
C. 水杨酸钠
D. 吡罗昔康
E. 阿司匹林
微信支付 
支付宝支付