“种瓜得瓜，种豆得豆”这一生物学现象主要取决于细胞结构中的（  ）

    Dear Adam,

    I'm on vacation in Central America and having a great time. I'm in Guatemala. It's a small country but there is so much to see and do! There are volcanoes (火山), mountains, rainforests, beaches and Mayan temples (玛雅寺庙) in the country.

    The Mayan people have a long and interesting history. They built many temples. Last Friday I visited a Mayan temple at a place called Tikal. The temple has a history of about 1,300 years. It is a wonderful place to visit.

    I am staying at Lake Atitlan now. Some people say it is the most beautiful lake in the world. It is a very big lake and there are mountains and volcanoes around it. You can walk around the lake and even climb to the top of a volcano.

    The volcanoes at Lake Atitlan are not active volcanoes (活火山), but tomorrow I am going to see an active volcano called Pacaya. Active volcanoes can be dangerous because they still erupt (爆发) sometimes. I want to climb Pacaya. It erupted in 2010. I hope it won't erupt when I' m there!

      I'll send (发送,) you another e-mail soon.

                                                      All the best,

                                                       Kate

先后进谏200多次，深得唐太宗器重的大臣是（    ）

亚洲的地势特点是（）