C. Early love makes young people keep close to their friends and parents.

　　D. Parents should help their children to be aware of the signs of depression.

　　69. What’s the author’s attitude towards puppy love?

　　A. Confused.

　　B. Disinterested.

　　C. Scared.

　　D. Disapproving.

　　70. What’s the main idea of the passage?

　　A. Puppy love may bring young people depression.

　　B. Parents should forbid their children’s love.

　　C. Romance is a two ­ edged sword for adults.

　　D. Romance is good for young people.

　　D

　　Watching bison up close is fascinating, like watching a grass fire about to leap out of control. With their huge, wedge-shaped heads and silver-dollar-size brown eyes, the 2,000-pound animals are symbols of another place and time. More than 100 bison now roam the 30,000-acre American Prairie Reserve in eastern Montana — the first time they’ve inhabited that region in a century. Direct descendants of the tens of millions of bison that once populated the Western plains, they represent an epic effort： to restore a piece of America’s prairie to the national grandeur that Lewis and Clark extolled two centuries ago. During that famous expedition across the Western states to the Pacific, the two explorers encountered so many bison that they had to wait hours for one herd to pass.

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