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Article: Mr Smith works in a factory in the middle of the city. The factory is not far from his home. It is about 800 meters away. So Mr Smith doesn't go to work by bus. He usually goes there by bike, sometimes he walks to work. It takes him 10 minutes to get there by bike or 20 minutes on foot. He usually leaves home at ten minutes to eight. Today something is wrong with his bike. He wants to walk there. His work starts at half past eight in the morning and finishes at a quarter to five in the afternoon. ,. Question: What does Mr Smith do? Yes or no, is the answer "He is a worker."?
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No

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Article: Snowflakes! You can catch them on your tongue or use them to make a perfect snowball. But have you ever thought about taking pictures of them? Ken Libbrecht did. He is a physics professor from California. Although the weather in California is usually warm and sunny, Ken's hobby is taking pictures of snowflakes. He travels to cold areas like Alaska and Canada to find snowstorms and take pictures of the snowflakes. "They are often beautiful, and every snowfall brings new surprises," says Ken. Ken takes pictures of snowflakes with a high-quality digital camera. He uses a microscope to make the tiny snowflakes larger. To get the best images, Ken built a special photo-microscope just for snowflakes. He collects flakes by letting them fall onto a piece of foam board . The pictures must be taken outdoors, so Ken wears lots of clothes to stay warm. But his fingers often get cold, because it's difficult for him to take pictures of a tiny snowflake with gloves. Each snowflake has shapes and patterns that make it as unique as a person's fingerprint. The hobby of snowflake photography is also unique. Next time a snowstorm blows through your town, take a closer look at the flakes before you gather them into a snowball. See if you can notice their unique patterns. Millions of snowflakes are waiting for you! ,. Question: What does the passage mainly tell us? Yes or no, is the answer "Ken Libbrecht's snowflake photography."?
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No

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Article: QQ is one of the most popular chat tools among teenagers .We regard it as an important chat tool in our daily life because it has some advantages . First, we can make lots of e-friends on QQ.It is easy to find the person who has the same interest as us ,and we can talk with him or her happily .Second ,we can also join a QQ group to find the information we need .For example ,if we want to learn English well ,we can choose a group with many English lovers in it .Third ,we can also play games with our friends on QQ and always have fun . QQ brings us a lot of benefits ,but it can also cause some problems .It's dangerous to tell strangers on QQ our real personal information like telephone numbers , addresses and ID numbers .If we spend too much time chatting online ,it won't be good for our study and health . Question: QQ will be good for us if _ . Yes or no, is the answer "we get some useful information we need ."?
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No