正常情况下，人类精子的染色体组成是（　　）

有关下面等高线地形图中，说法不正确的是（　　）。

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    我有一个好朋友，它圆圆的身子，亮晶晶的脸，三只小胳膊，整天“滴答滴答”地转个不停，非常惹人喜爱。晚上睡觉时，它“滴答滴答”地跟我说悄悄话；早上，我睡得正香，它“滴答滴答”地把我唤醒，催我上学。你说，我的好朋友是谁？

—How do we go there?  

— ____ ____.     

用方框中所给单词的适当形式填空。

         As we know, there are many beautiful places in China, such as Hong Kong, Harbin. They attract a lot of people at home and abroad. But it's hard for ____ to choose where they can go. You can tell them ____ Guide to China, which ____ China in detail. If they have no chance to go through the book, you may show them advertisements for traveling, then after ____, they can decide where to go. They will have a good trip and take photos in ____ of it.