There are no days when men and women couldn't associate with each other. When we are asked if boys and girls can associate with each other, most of us will say, "Yes, of course. Why not? " If we want to deal with the association between boys and girls properly, here are some tips for you to follow. 1)Keep a normal and healthy state of mind . Our schools and classes are made up of boys and girls. It is very natural for the boys and girls to contact each other and build up the friendship with the students of the other sex. Generally speaking, we should broaden the circle of the association. We should make as many friends as possible. We should have more friends of the other sex instead of one or two. We should contact the students in public, not in secret. 2)Contact students of the other sex warmly, generously and sincerely. Don't be too nervous or too shy in contact with a person of the other sex, because no one likes a person who is too shy to say a word. 3)Don't fall into the ditch of early love. The boys and the girls at adolescence are rich in feelings and full of imagination . They are easy to regard the friendship as a sign of love and fall in love with each other at an early age. In my opinion, early love is a green apple that can't be eaten. An apple won't taste sweet until it is fully ripe . Do keep out of early love. We should contact the students of the other sex in the following ways EXCEPT _ . A) with a good state of mind B) in public C) in secret D) warmly and generously
C
Redwood trees are the tallest plants on the earth,reaching heights of up to 100 meters.They are also known for their longevity,typically 500 to 1000 years,but sometimes more than 2000 years.A hundred million years ago,in the age of dinosaurs,redwoods were common in the forests of a much more moist and tropical North America.As the climate became drier and colder,they declined to a narrow strip along the Pacific coast of Northern Califomia. The trunk of redwood trees is very strong and usually forms a single straight column.It is covered with a soft bark.This bark can be pretty thick,well over two feet in the more mature trees.It gives the older trees a certain kind of protection from insects,but the main benefit is that it keeps the center of the tree harmless from moderate forest fires because of its thickness.This fire resistant quality explains why the giant redwood grows to live that long.While most other types of trees are destroyed by forest fires,the giant redwood actually prospers because of them. Moderate fires will clear the ground of competing plant life,and the rising heat dries and opens the ripe fruit of the redwood,releasing many thousands of seeds onto the ground below. New trees are often produced from shoots,little baby trees,which form at the base of the trunk.These shoots grow slowly,fed by the root system of the "mother'' tree.When the main tree dies,the shoots are then free to grow as full trees,forming a "fairy ring" of trees around the original tree.These trees,in turn,may give rise to more shoots,and the cycle continues. Why were redwood trees easier to find in the forests of North America millions of years ago? A) The trees were taller and stronger. B) The soil was softer for seeds to develop. C) The climate there was warmer and wetter. D) The temperature was lower along the Pacific coast.
C
Q: My friends, Emma Daniels, spent the summer of 1974 traveling in Israel. During her monthlong stay in Jerusalem she often went to a cafe called Chocolate Soup. It was run by two men, one of whom - Alex - used to live in Montreal. One morning when Emma went in for coffee, while chatting with her new friend Alex, she mentioned that she had just finished the book she was reading and had nothing else to read. Alex said he had a wonderful book she might like, and that he'd be happy to lend it to her. As he lived just above the cafe, he quickly ran up to get it. The book he handed to Emma just minutes later was Markings, a book by a former Secrcetary-General of the United Nations (UN). Emma had never read it, nor had she ever bought a copy. But, when she opened it up, she was floored to see her own name and address inside the cover in her own handwriting.It turned out that the summer before, at a concert back in Montreal, Emma had met a Californian who was in town visiting friends. They decided to exchange addresses, but neither of them had any paper. The man opened up a book he was carrying in his backpack and asked Emma to write her name and address inside. When he returned to California, he left the book behind in Montreal, and his friend Alex kept it. When Alex later moved to Jerusalcm, he took the book along. Alex lent Emma the book, Markings, _ . A) to show his friendliness to her B) to show his interest in reading C) to tell her about the importance of UN D) to let her write her name and address inside
A: A
Living in the wild can be hard. Finding food and staying safe aren't easy. Each day, animals struggle to survive in their habitats. Not all animals get by on their own. Some animals form a close partnership with other kinds of animals. These pairings are called symbiotic relationships. In a symbiotic relationship, the animals depend on each other. One animal helps the other meet its needs. Sounds good, right? Not always. Some animals are not very kind to their partners. In some cases, one animal meets its needs but hurts its partner. Take ticks, for example. These insects suck blood to live. To get blood, they attach themselves to other kinds of animals. Ticks can pass germs that cause disease instead of helping their hosts. In other relationships, animals don't treat their partners so poorly. Both animals benefit from living with the other animal. Small animals called cleaner shrimps have found a way of helping fish at coral reefs. As their name suggests, the shrimps clean the fish. They hang out at what scientists call a cleaning station. A fish stops by. Then a shrimp climbs onto the fish and even steps into the fish's mouth. The shrimp uses its tiny claws to pick stuff off the fish's body. That can include dead skin, tiny pieces of food, and wee creatures that can hurt the fish. The fish gets a nice cleaning. The shrimp enjoys a tasty meal of fish trash. Small birds called plovers are also in the cleaning business. They have big customers-crocodiles. Crocs have long snouts filled with sharp teeth. Cleaning them is tricky. When a croc opens its mouth, the plover hops right in. The croc does not snap its snout shut.Instead, it lets the plover eat small, harmful animals attached to the crocodile's teeth. The plover gets an easy meal while the croc gets clean teeth. Why do the cleaner shrimps clean the fish? A) To get fish trash for food. B) To eat wee creatures. C) To help fish go out of coral reefs. D) To get food for fish.
A