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为何妊娠末期孕妇长时间仰卧位易发生低血压？

答案

参考答案：于妊娠末期，孕妇长时间取仰卧位姿势，增大的妊娠子宫压迫下腔静脉，使回心血量和心排出量减少而出现低血压。若改为侧卧姿势，下腔静脉受压改善，血流通畅，血压迅即升高并恢复正常。

填空题
用方框中所给单词的适当形式填空，使短文完整正确
do; invite; grow; knife; care; eat; serve; have; surprise; hand

     When you are invited to a meal in Thailand(泰国), the words of the 1          mean "come and eat
rice". In fact, nearly all Thai dishes 2          with rice, which 3           there very easily because the
climate(气候) is warm and there is much rain.
    The food that is served is always out into pieces, so there is no need to use 4            and forks, but
instead, special 5             and now there are still some people who eat this way. There is a special way
of 6             it.  First they wash their right hands in a bowl of water, they only eat with their right hands.
They are 7             not to let the food touch the palms (手掌心) of' their hands. After the meal! The
hands are again carefully washed.
      The meal usually 8           several different dishes. They are all hot. They 9             in bowls which
everyone shares(共享), though each person has their own bowl of rice. Thailand has a long coastline
(海岸线), it is riot 10            that fish and shellfish play an important part in Thai cooking.
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单项选择题

研究者认为广东河源是（）。

A、客家摇篮

B、客家古邑

C、世界客都

D、客家之源
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