正确答案: A

洪涝

题目：该地形区应重点防御的自然灾害是

解析：A

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学习资料的答案和解析：

[多选题]脂质具有的生物学功能是

构成生物膜 B．调节生理代谢

储存能量 D．携带遗传信息

解析：脂质包括脂肪，类脂和固醇。类脂中的磷脂是构成生物膜的基本骨架，固醇类激素能调节生理代谢，脂肪能储存能量，而携带遗传信息是核酸的功能。

[单选题]

a firm hold

[单选题]In the girl’s long painstaking training process, _____.

her writing turns into an automatic pattern of performance

[单选题]D Sitting on the peaceful coast of the Calapagon Islands. Ecuador , watching the sun move quietly into the sea, you shouldn’t forget the Charles Darwin (1809 – 1882) arrived here in 1835. He famous work. On the Origin of Species. You can certainly follow Darwin’s footsteps and enjoy a trip from four to seven days to the islands. The islands are centainly a paradise (天堂) for wildlife, as there are no natural killers on the islands and the number of beais and visitors is under govenment control.Though you cannot walk freely as Darwin die hour 200 years ago ,esch day is as impressive as it could be. The most well crown animal of the Calapagos is the giant tortoisc ( 巨型陆龟),which can be seen moving slowly around the highlands of Sanra Cruz,the second largest island in the suchipelago.Some of these creatures are so old that they might have been seen in their youth by Darwin himself. Despite strict control over activities and timing,you stay on the Galapagos will be remembered as a chain of incomparable pictures;diving with sea how that wim and play within inches of you; feeling small shaks touch you feet as you swim and ,most magically , seeing a with and her bady surface with great breath of air. Travleing between the islands and observing the wildlife that so inspired Darwin , you will fell as though you are getting a special view of an untouched world .At night you will sleep on board the ship , leaving the wildlife in complete occupation of the islands, which are as undisturbed now ai they have been since the beginning of time.第68题：What do we know about Darwin’svisit to the istands.

studkd afleient cnt cpeatures on the islands.

[单选题]松柏类茎的分枝是单轴分枝。( )

正确

[单选题]金银花花的特点为( )。

花色由白变黄