Mr. Pickles and Mrs. Pickles are radiated tortoise(射纹龟). Mr. Pickles is 90 years old this year (2023). These days, something good happened. Mr. Pickles became a dad for the first time!

The babies are a big deal because Mr. Pickles is thought to be the most genetically valuable(基因价值的) radiated tortoise in the Association of Zoos and Aquariums’ Species Survival Plan. Radiated tortoises have few babies. So there are only a very small number of them.

The Zoo said that on March 16 three radiated tortoise eggs had hatched(孵化). The zoo workers named the babies Dill, Gherkin and Jalapeño.

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1. What do the underlined words “a big deal” mean?（词义猜测）

A    Important.

B    Busy.

C    Lazy.

D    Healthy.