下列生物中，在生态系统中一定是生产者，而其细胞结构中无成形细胞核的生物是（     ）

阅读下面语段，按要求作答。

    文川里，从明清走来，穿过民国，历经百年风雨。念念藏匿深巷中的飘香字眼；小姐楼、吟香阁、知守斋；探探遗失光阴角落的府邸老宅：魏厝、郑厝、洪厝。文川里承载的记忆一阕阕如诗如画，尽管xī日繁华褪去，但老街巷让我们铭记过去，不致健忘。

请在拼音格中给划线字注音，并根据拼音在米字格中写出汉字。

From:    annel@freemai14all.com    Sent: Wed., Oct. 19

To:      tss_liam@kidstarmail.net

Subject: Hello!

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Hi, Liam!

      So you're my new pen friend. Let me tell you a bit about myself. I'm 14 years old and I live in Calgary, CanadaI have two older brothers, Brian and Sam. I'm the only girl.

      I love sports and I'm always looking for exciting new hobbies to try. I like playing baseball in winter.

      It's fun beating the boys! But summer is my favourite time of the year. I love skateboarding and rock climbing in summer.

     Skateboarding's great because it's so fun and easy to learn! I often skateboard after school. There are many placesin the park where I can do stunts. I'm good at stunts like jumping and turning the skateboard!

     Rock climbing is also really fun. I usually climb with my dad on weekends. We can't do it on real mountains very often because we live in the city. We do indoor rock climbing instead but it's not as challenging.

    So that's me! How about you? Please write back soon!

Bye for now!

Anne　

能源、信息和材料是现代社会发展的三大支柱，下列说法正确的是（　　）