函数y=y(x)是由方程exy+x-y-2=0所确定,则y’(0)=()。
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In ancient time the most important examinations were spoken, not written. In the schools of ancient Greece and Rome, testing usually (36) of saying poetry aloud or giving speeches. In the European universities of the Middle Ages, students who were working for (37) . degrees had to discuss questions in their field of study of the (38) . This custom exists today as part of the work of testing (39) for a master’s or doctor’s degree. Generally, however, (40) examinations are written. Two types of tests are (41) used in modern schools. The first types sometimes called an objective test; it is (42) to deal with facts, not (43) 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 (44) 。 The student has just one task: (45) . 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. (46) . A lucky student may guess the correct answer without really knowing the material. In ancient time the most important examinations were spoken, not written. In the schools of ancient Greece and Rome, testing usually (36) of saying poetry aloud or giving speeches. In the European universities of the Middle Ages, students who were working for (37) . degrees had to discuss questions in their field of study of the (38) . This custom exists today as part of the work of testing (39) for a master’s or doctor’s degree. Generally, however, (40) examinations are written. Two types of tests are (41) used in modern schools. The first types sometimes called an objective test; it is (42) to deal with facts, not (43) 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 (44) 。 The student has just one task: (45) . 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. (46) . A lucky student may guess the correct answer without really knowing the material.
设函数f(x)可导,则y=ex2f(e-x2)的导数y’等于()。
A. f’(e-x2)
B. -f’(e-x2)
C. -2xf’(e-x2)
D. 2xex2f(e-x2)-2xf’(e-x2)
Passage One Questions 26 to 29 are based on the passage you have just heard.
A. To ask commercial counselor’s office of our embassies stationed abroad for help.
B. To establish good relationship with foreigners.
C. To send trade groups abroad every now and then.
D. To have face-to-face talks with foreign businessmen.
Questions 19 to 22 are based on the conversation you have just heard.
A. The woman has already bought the tickets for the theatre.
B. The woman will watch a tennis match next Saturday.
C. The woman will have a ride in the countryside next Sunday.
D. The woman will go somewhere else first next Sunday.