There is much debate as to     1     makes a healthy diet. For example, scientists     2     (insist) for years that a big enemy of health is fatty food. However, there is increasing e    3     (证据) that the real driver of poor health is not so much fatty food, as it is sugar. In America, people who receive 25% of their daily calories or more through sugar are twice as likely     4     (die) from heart disease than people who receive less than 10% a day.

Therefore, it is necessary     5     (cut) down the foods that contain high amount of sugar. The American Heart Association     6     (recommend) that we limit ourselves to less than 100-150 calories a day from sugar,     7     is less than what is usually contained in one can of sweet drink or in a single candy bar.

Finally, there is no t    8     (窍门) healthy eating. Rather, healthy eating starts with having a healthy a    9     (态度) towards food. If you are using food mostly for     10     (nutritious), then you are on the right track with your diet. However, if food has become the centre of your life, you might be on the road to bad health. It is up to you to decide.

Tibetan antelopes live on the plains of Tibet, Xinjiang and Qinghai. Watching them move slowly     1     the green grass, I’m     2    (strike) by their beauty and also reminded of the danger they were in. They were hunted     3    (legal) for their     4    (value) fur.

Economic development is necessary if we want to improve society. There comes     5     time when the old must give way     6     the new and it is not possible     7    (preserve) everything from our past as we move towards the future. Finding and     8    (keep) the right balance between progress and the protection of cultural sites can be a big challenge. Big challenges, however, can sometimes lead to great     9    (solve).

By     10     (share) so many digital photos over the Internet, the group hopes to promote even     11     (wide) interest around the world in China’s ancient history, culture and traditions. They also hope to     12    (far) educate people about the importance of safeguarding historic and cultural relics for future generations to understand and appreciate.     13     one researcher who is working on the project explains, “Appreciating one’s own cultural heritage is very important for understanding     14    (one). Appreciating the cultural heritage of other countries is very important for international     15    (communicate) and understanding.”