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关于胎盘功能的叙述，哪项是错误的
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阅读下面短文，从短文后所给各题的四个选项(A、B、C、D)中选出能填入相应空白处的最佳选项。 Martin Luther King Jr. was born in Georgia in 1929. When was (36) a boy Martin learned that his (37) , the black Americans, were (38) treated differently from most of (39) fellow Americans. Many could not attend good schools, (40) good jobs, or live in nice houses because of the color of their (41) . Martin knew that in a free country this was (42) . He wanted to help his black brothers, (43) he decided to go to school and 44 a minister. He became a pastor (牧师) in Montgomery, Alabama. This is (45) Martin Luther King’s "peaceful fight" first began. Dr. King worked (46) equality in other cities. He knew that the (47) way people could win their rights was to remain peaceful, (48) in face of danger. Dr. King won the Nobel Peace Prize in 1964 for his achievements and (49) . The whole nation (50) the terrible event that (51) on April 4, 1968, in Memphis, Tennessee. Martin Luther King Jr. was (52) . The man who had preached (倡导) nonviolence (非力) died (53) . But Dr. King’s dream can never (54) . Many Americans are still (55) to make that dream come true.
阅读下面短文，从短文后所给各题的四个选项(A、B、C、D)中选出能填入相应空白处的最佳选项。 Martin Luther King Jr. was born in Georgia in 1929. When was (36) a boy Martin learned that his (37) , the black Americans, were (38) treated differently from most of (39) fellow Americans. Many could not attend good schools, (40) good jobs, or live in nice houses because of the color of their (41) . Martin knew that in a free country this was (42) . He wanted to help his black brothers, (43) he decided to go to school and 44 a minister. He became a pastor (牧师) in Montgomery, Alabama. This is (45) Martin Luther King’s "peaceful fight" first began. Dr. King worked (46) equality in other cities. He knew that the (47) way people could win their rights was to remain peaceful, (48) in face of danger. Dr. King won the Nobel Peace Prize in 1964 for his achievements and (49) . The whole nation (50) the terrible event that (51) on April 4, 1968, in Memphis, Tennessee. Martin Luther King Jr. was (52) . The man who had preached (倡导) nonviolence (非力) died (53) . But Dr. King’s dream can never (54) . Many Americans are still (55) to make that dream come true.
正常情况下，哪种凝血因子在妊娠期间不增加
阅读下列短文，从每题所给的四个选项(A、B、C和D)中，选出最佳选项。A In ancient (古代) time the most important examinations were spoken, not written. In the schools of ancient Greece and Rome, testing usually consisted of saying poetry aloud or giving speeches. In the European universities of the Middle Ages, students who were working for advanced degrees had to discuss questions in their field of study of the subject. This custom exists today as part of the work of testing candidates (候选人) for a master’s or doctor’s degree. Generally, however, modern examinations are written. Two types of tests are commonly used in modern schools. The first type is sometimes called an objective (客观性) test, it is intended to deal with facts, not personal opinions. To make up an objective test, the teacher writes a series of questions, each of which has only one correct answer. Along with each question the teacher writes the correct answer and also three statements that look like answers to students who have not learned the material properly. The student has just one task: he must recognize the correct answer and copy its letter or number on his examination paper. For testing a student’s memory of facts and details, the objective test has advantages. It can find out a great deal about the student’s range of knowledge. For testing some kinds of learning, however, such a test is not very satisfactory. A lucky student may guess the correct answer without really knowing the material. Which of the following statements about the objective test is TRUE
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