有四包真空小包装火腿，每包以标准克数（450克）为基准，超过的克数记作正数，不足的克数记作负数，以下数据是记录结果，其中表示实际克数最接近标准克数的是（　　）

“法律条文没有作出规定的，法官就不能受理。譬如有公民的奴隶被人拐走或偷跑掉，此公民要求法律受理就要找法官，向他申明：根据某某法律，我认为此奴隶应归我所有。法官确认后才能受理。”这一描述主要说明罗马法（    ）

B

    Last week, scientists said they discovered a new birdlike dinosaur. With feathers, a beak (鸟嘴) and long legs, it looked pretty funny. This kind of dinosaur was 3 meters (10 feet) long, and it was higher than most humans. It also had sharp claws (爪子).

    Fossil hunters dug out the bones of this species in a rocky place of southwest North Dakota. The scientists nicknamed this dinosaur the "Chicken from Hell". They also gave it a more formal name: Anzu Wyliei. Anzu was a mythical (神秘的) fire-breathing bird. Wylie is the dinosaur-loving grandson of a man who supports the Carnegie Museum of Natural History in Pittsburgh, Pa. Scientists at that museum were part of the team that told the new dinosaur in a paper published on March 19 in the journal PLOS ONE. "The Anzu dinosaur is based on a surprisingly nice specimen(样品), and past digs turned up this animal," a scientist told Science News for Students.

青蛙从____到____的发育过程中，在____和____ 上有显著的变化，因此青蛙的发育是____。