问题
单项选择题
脱羧基后的产物可使血管舒张的氨基酸
A．丙氨酸
B．谷氨酸
C．精氨酸
D．组氨酸
E．天冬氨酸
答案
参考答案：D
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脱羧基后的产物可使血管舒张的氨基酸
A．丙氨酸
B．谷氨酸
C．精氨酸
D．组氨酸
E．天冬氨酸
参考答案：D
One Sunday morning, Millie and Amy went to Sunshine Park. They love to chat there. As usual, they sat ___26____a big tree. Suddenly, they heard a whistle from the bushes behind the tree. They turned around but could not  see anything unusual. They were ____27______.“Is 28 there?” Millie asked. Nobody answered. They 29 very carefully and heard the strange noise again. The two girls were very afraid. They ran away quickly. On their way, they met Andy. “What happened?” Andy asked. “There’s a ghost in the 30 . Please help us.” Millie said. “Really? Tell me more.” Andy said. Millie told Andy everything. Andy went to the park, 31 beside the tree and listened carefully. Then he heard 32 noise! He looked behind the tree and heard another whisper. He was now sure the sound 33 from the bushes. He searched carefully. “Oh! Here it is.” Andy said to himself. He 34 a little cat in the bushes. It was very weak. When it miaowed, 35 made a sound like a whisper.
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