Who often came to eat at the Happy Restaurant？
A. Husbands and wives.
B. men and their children.
C. men and their women friends.
查看答案
因为肽键-CO-NH-中的C-N键可以自由旋转，而使多肽链折叠出现多种构象。 ()
A. 正确
B. 错误
According to the passage (文章) ,when a man and a woman came to the restaurant, who paid the food？
A. The man always paid the food.
B. The woman always paid the food.
C. Sometimes the man paid the food, sometimes the woman paid the food.
嘌呤核苷酸循环是存在于骨骼肌和心肌中的一种特殊的联合脱氨基作用方式。 ()
A. 正确
B. 错误
What did Baker do after he shot at the wood from fifty yards away？
A. He drew a target round the hole.
B. He brought it in a car.
C. He put it in the garden.
微信支付 
支付宝支付