B. Only foreign customers.

　　C. Every customer from home and abroad.

　　D. Only Chinese customers.

　　70. What’s the main idea of Paragraph 4?

　　A. Lao She.

　　B. Lao She’s Teahouse.

　　C. The story of Teahouse.

　　D. The play Teahouse.

　　D

　　In Antarctica(南极), when spring comes, ice begins to melt, and the sun stays in the sky all night long.

　　In the brightly world, the large gray head of a Weddell seal (威德尔海豹) appears through a crack (裂缝) in the ice. The seal takes several deep breaths, and then she opens her mouth, turning her head from side to side. With her teeth, she gets rid of bits of ice. Seals are mammals(哺乳动物), and they need to breathe air, for which Weddell seals use their teeth to make sure their breathing holes stay open.

　　The seal makes the hole bigger, and when she can fit her large body through it, she jumps out onto the ice—she is getting ready to have a baby. On the ice shelf, the seal gives birth to a baby. The baby is about three feet long and is covered with thick fur that protects it from the cold wind. The baby drinks its mother’s milk and grows quickly. With a few weeks, it is more than six feet long. Under the seal’s skin is thick layer of fat called blubber, which keeps the seal warm in its frozen world.

　　When the baby seal is about two weeks old, it begins to dive with its mother. They slide through the breathing hole into the water below the ice, where the baby seal learns to swim, diving deeper and deeper. In order to stay underwater, it must learn to hold its breath and control its heart rate.

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