保护环境已成为全人类的一项共同任务，在这一行动中，我们一方面要保护好____ ，一方面要防治____ 。

下列各项中，表示男性体细胞和精子染色体组成的是（  ）

阅读下面短文，从短文后所给的A、B、C三个选项中选出能填入相应空白处的最佳选项。

    What is the best way to study? This is a very important question. Some Chinese students often 1 very hard for long hours. This is a 2 habit, but it is not a better way to study. An efficient (高效的) student must 3 enough sleep, enough food and enough rest. Every week you 4 to go out for a walk or visit some friends or some nice places. It's good for your study. When you 5back to your study, you'll find yourself 6 than before and you'll learn more.

    Maybe we can 7that learning English is like taking Chinese medicine. We don't mean that it's 8. We mean that like Chinese medicine, the effect (效果) of your study 9 slowly but surely.

     10 slowly but surely every day and effects will come just like Chinese medicine.